Praxis 5005 science Flashcards
what is the earths only natural satelite?
the moon
what are earth’s months based on?
moons rotation around the earth
what do fossils give us?
a record of how life on earth has changed over time
what don’t fossils give us complete evolution?
because not all organisms get preserved and not all fossils are found
How were the Hawaiian Islands formed?
stationary hot spots that came from the outer core
how did one hot spot in hawaii form all the islands?
the pacific tectonic plate moved over the course of thousands of years therefore creating multiple islands
what are gametes?
sperm and egg cells
what are zygotes?
fertilized eggs
What are haploid cells?
when you have 23 chromosomes (n)
what are diploid cells?
when you have 46 chromosomes (2n)
What are earth’s compositional layers?
Crust/Lithosphere, mantle, core
crust (compositional layer)
Outermost solid layer and made
What material is in the Mantle (compositional layer)?
not liquid, composed of aluminum, silicates, & plastic
Lithosphere (mechanical layer)
outer most, rigid, earth’s crust
What material is in the Asthenosphere (mechanical layer)?
not a liquid, soft plastic
What material is in the Mesosphere (mechanical layer)?
material flows but at a slower rate, stiff plastic
What material is in the outer core (mechanical layer)?
layer of liquid iron and nickel, only layer of earth that is a true liquid
What does the Hydrosphere contain? (Earth’s Spheres)
all water on earth in liquid form (lakes, rivers, oceans)
What does the biosphere contain? (earth’s sphere)
all ecosystems and living organisms
What does the cryosphere contain? (earth’s sphere)
masses of frozen water (frozen lakes, rivers, oceans, glaciers)
What are Earth’s Spheres?
lithosphere, hydrosphere, biosphere, cryosphere, atmosphere
What is in the atmosphere (earth’s sphere)?
gasses that surround the planet
What gasses surround the planet?
nitrogen: 78%, oxygen: 21%, argon: 0.09%, helium: small traces, neon: small traces
What are the compositional layers?
crust, mantle, core
What are the mechanical layers?
lithosphere, asthenosphere, mesosphere, outer core, inner core
What are Earth’s atmosphere?
troposphere, stratosphere, mesosphere, thermosphere, exosphere
What occurs in the Troposphere?
most weather occurs here, 0-12 km
What occurs in the stratosphere? What does it absorb?
ozone layer, 12-50 km, absorbs 97-99% of suns ultraviolent light
How many km is the mesosphere?
50-80 km
How many km is the thermosphere?
80-700 km
How many km is the exosphere?
700-1000 km
what processes happen in the lithosphere?
geographic landscapes are formations made by rocks
What are the formations in the lithosphere?
mountains, volcanoes, canyons
how are mountains formed?
formed from the tectonic plates smashing together
How are volcanoes formed?
formed when magma from the earth’s upper mantle erupts through the surface
How are canyons formed?
formed by weathering and erosion caused by movements in rivers and by tectonic plate activity
what causes earthquakes?
by plates rubbing against each other in an opposite motion which causes rocks underground to break along the fault therefore this causes energy to be released causing seismic waves
what are the magnitude ratings?
3-4.9= minor or light, 5-6.9= moderate to strong, 7-7.9= major, 8 or more= great
what are the types of seismic waves?
primary (p waves), secondary (s waves), surface
what are primary waves (p waves)?
fastest waves ( 3 miles per second), can travel through solid, liquid, gases
what are secondary waves (s waves)?
travel through earth’s interior at half the speed of p waves (1.5 miles per second), can travel through rock but not liquid or gas
what are surface waves?
move along earth’s surface, slowest waves
what are tsunamis?
giant waves cause by earthquakes or volcanic eruptions under the sea
what happens when tsunamis travel inland?
they build up to higher and higher heights as the depth of the ocean decreases
what does tsunamis speed depend on?
ocean depth
what is plate tectonic theory?
earth’s outer shell is divided into several plates that glide over the mantle or the rocky inner layer above the core
what does plate tectonic theory do?
the plates move and separate causing earth to separate and change
what are the types of plate tectonics?
divergent, convergent, and subduction
what does divergent mean?
to pull apart
what does convergent mean?
they come together
what does subduction mean?
sideways and downward movement of the edge of a plate into the mantle beneath another plate
what is soil?
mixture of minerals, organic matter, gases, liquids that support life on earth
what are layers of soil in order?
topsoil, subsoil, bedrock
what is the water cycle?
the continuous circulation of water throughout earth and earth’s atmosphere
what is another name for the water cycle?
hydrologic cycle
what are the main stages of the water cycle?
evaporation, condensation, precipitation, transpiration
What is precipitation?
Any form of water that falls from clouds and reaches Earth’s surface (rain & snow)
what is evaporation?
when water turns from a liquid to a gas (water vapor)
what is condensation?
gas (water vapor) turns back into a liquid, water collects as droplets on a cold surface when humid air is in contact with it, forming clouds
What is transpiration?
plants suck water from the roots into the small pores in leaves which releases gas (water vapor) the atmosphere
how old in earth?
4.5 billion years old
what is an eon?
a very long period of time
When was the Hadean Eon formed?
4.5 billion
What were the temperatures and activities that formed in the Hadean Eon?
temperatures were extremely hot and volcanic activity
What kind of life was in the Hadean Eon?
no life
What was the Hadean Eon formed by?
formed by debris around the solar protoplanetary disk
what key feature formed in the Hadean Eon?
the moon
When was the Archean Eon formed?
2.5 billion
What kind of life was formed in the Archean Eon?
prokaryote and other first forms of life
What was the atmosphere composed of in the Archean Eon?
volcanic and greenhouse gasses
When was the Proterozoic Eon formed?
541 billion
What kinds of life were formed in the Proterozoic Eon?
eukaryote, multicellular organisms, bacteria began producing oxygen, plants, animals, early fungi formed
What did the Proterozoic Eon do for earth’s atmosphere?
shaped the third & current of earth’s atmosphere
What kinds of life formed in the Phanerozoic Eon?
complex life including vertebrates begin to dominate the ocean, familiar forms of plants, animals, and fungi, animals including humans evolve at the most recent phase
When was the Phanerozoic Eon formed?
541 million- present
what are rocks?
naturally occurring solid mass or aggerate of minerals or mineraloid matter
how are rocks categorized?
by minerals they include, chemical composition, and formation (origin)
what are the 3 categories of rocks?
igneous, metamorphic, sedimentary
what are igneous rocks made of?
lava & magma
what do igneous rocks look like?
glassy, smooth, gas, bubble holes, random arrangement of minerals
what are examples of igneous rocks?
granite, pumice, obsidian
what are metamorphic rocks made of?
heat pressure
what do metamorphic rocks look like?
sparkly, crystals, ribbon like layers
what are examples of metamorphic rock?
marble, slate, gneiss
what do sedimentary rocks look like?
sand grains, visible pebbles fossils may be visible
what are sedimentary rocks made of?
deposition, cementation
what are examples of sedimentary rocks?
conglomerate, sandstone, limestone, shale
characteristics of Earth:
third planet from the sun, densest planet, largest of the four terrestrial, only known object to harbor life
What does earth’s tilt cause?
seasons
the _____ is the star at the center of the solar system and is earth’s most important source of energy for life
sun
what is the solar system?
planetary system that orbits the sun, which includes 8 planets and their natural satellites, dwarf planets, asteroids, comets, & particles of smaller debris
what other planet is similar to earth in size, density, and mass?
Venus
what other planet is like earth in terms of rotation and tilt on it’s axis?
mars
What is the order of the planets from the sun?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
how do you remember the order of the planets?
My Very Educated Mother Just Served Us Noodles
what are comets?
chunks of ice and rock originating outside of the solar system
what are asteriods?
chunks of rock and metal in orbit between mars and jupiter
What are meteorites?
small asteriods
what is light year?
a unit of astronomical distance equal to the distance light travels
If something is 4 light years away from earth how long will it take to be visible from earth?
4 years
what is speed of light?
300,000 km/s
what does earth’s tilt cause?
the seasons
what happens when earth is tilted towards the sun?
it is warmer (summer)
what happens when earth is tilted away from the sun?
it is colder (winter)
characteristics of the fall & autumn equinox?
12 hrs of both daylight and darkness & september 23
characteristics of summer solstice
maximum tilt towards the sun causing the longest period of daylight & june 22
characteristics of the spring vernal equinox
12 hrs of both daylight and darkness & march 21
characteristics of winter solstice
north pole is tilted furthest away from the sun causing the shortest period of daylight & december 21
what marked the emergence of modern science and the heliocentric model regarding the universe?
scientific revolution
what theory was believed before the heliocentric theory?
geocentric theory
what is the geocentric theory?
that earth sat stationary at the center of the universe
what is the heliocentric theory and who introduced it?
Nicolaus Copernicus & the sun was at the center of the universe and earth rotates on its axis while revolving around the sun
what does the moon do?
affects the tides
what does a waxing moon look like?
illuminated on the right side
what does a waning moon look like?
illuminated on the left side
what are stars?
luminous balls of gas, mostly hydrogen, held together by its own gravity
what do star colors rely on?
temperature
what is the color of a hotter star?
blue
what is the color of a cooler star?
red
what are the types of stars?
O, B, A, F, G, K, M
what is the color and temperature of a O star?
blue, 25,000 kelvin
what is the color and temperature of a B star?
blue, 11,000-20,000 kelvin
what is the color and temperature of a A star?
blue, 7,500-11,000 kelvin
what is the color and temperature of a F star?
blue to white, 6,000-7,500 kelvin
what is the color and temperature of a G star?
white to yellow, 5,000-6,000 kelvin
what is the color and temperature of a K star?
orange to red, 3,500-5,000 kelvin
what is the color and temperature of a M star?
red, under 3,500 kelvin
What is a lunar eclipse?
the earth comes first created a shadow on the moon called the umbra
What is a solar eclipse?
the moon comes first
what is the space race?
when the US was competing with Russia to be the first to put a man on the moon & began in 1957 when Russia launched Sputnik, the first artificial satellite & then the US committed to getting to the moon before Russia
what are earth’s patterns?
spins on its axis & makes one full revolution on its axis every 24 hours & revolves around the sun & 365 days to make one full revolution around the sun
what are earth’s cycles?
these cause day, night, seasons, weather, phases of the moon, water cycle, and life cycle
what are earth’s changes?
some changes happen quick some happen slow & -ex: north american and european tectonic plates are separated by the mid-Atlantic ridge, the two continents are moving away from each other at about 1 inch per year
what are earth’s magnetic poles?
magnetic fields that extend from its interior to outer space
what is calibrated by the magnetic poles?
compass
What does the magnetic field do?
morph, push, and pull at one another
magnetic poles on earth
magnetic field S pole is earth’s geographic north pole & magnetic field N pole is earth’s geographic south pole
what is the continental drift?
earth’s continents were once one big land mass that separated or drifted apart over time because of tectonic plates
what is the big landmass in the continental drift called?
Pangea
Who proposed continental drift?
Alfred Wegener in 1912
the practice of science should be outline in these skills (VERY IMPORTANT):
asking questions and defining problems developing and using models & analyzing and interpreting data & using math and comcuptational thinking & constructing explainations and designing solutions & obtaining, evaluating, and communicating information
what does science is inquiry based?
students must be given the opportunity to interact with the concepts they are studying
what is an example of inquiry based?
ex: stuyding living organisms & students need to observe living organisms and have the opportunity to touch, observe, and interact
what are living things?
have physical entities and biological processes such as homeostasis, cell division, cellular respiration, and photosynthesis
what three components make up cell theory?
all living things are composed of cells & all cells come from pre-exisiting cells & cell is the smallest unit of life
what is the organization of life?
cells, tissues, organs, organ systems, and organisms
what are the six different kingdoms?
Plantae, Animalia, Fungi, Protista, Eubacteria, Archaebacteria
What is a prokaryote?
unicellular organism that lacks a nucleus, mitochondria, or any other membrane bound organism
what is a eukaryote?
multicellular organism that contains a nucleus, mitochondria, and membrane based organelles
what does DNA do in the prokaryote cell?
floats freely throughout the cell
what two domains are prokaryote cells divided into?
archaea and bacteria
what are organelles?
the structure within the cell membrane or cell wall
what are the main structure of the organelles?
cellular membrane, nucleus, mitochondria, cytoplasm
what is cellular membrane?
fluid, permeable outside covering of the cell, in plant cell this is a cell wall and its rigid
what is nucleus?
command center of the cell, it controls the rest of the cell
what does DNA do in a eukaryote cell?
lives in the nucleus
What is the mitochondria?
powerhouse of the cell
what is cytoplasm?
water like substance in the cell