Unit 1 Flashcards
3 major types of boundaries
Convergent, Divergent, Transform
What geologic features are associated with convergent
Mountains, volcanoes, subduction zones
What geologic features are associated with divergent boundaries
rifts, valleys, ocean ridge
What geologic features are associated with transform
Earthquakes
Why do tectonic plates move?
Heat from the core
Evidence to support plate tectonics
Fossils, older land further out, lands used to fit together
What happens when a continental plate meets and oceanic plate
Submergent zone
When was the earth formed, how was it formed
4.6 billion years ago, it was a cloud of dust and it started to bond together
What was the beginning earth like?
it was mostly molten lava, no oxygen, no atmosphere, iron melted and in the core causing magnetic field to protect from solar
When and how was the moon formed
4.5 billion years ago, earth was hit by another planetessimal
How does the moon affect the earth
gravitational pull, causes tides
What two ways do scientists think water came to be on earth
Volcanic outgassing and ice bearing comets
What was Earth’s early atmosphere like?
It wasnt a thing
Earth’s axial tilt
caused by the collision between earth and the planetessimal when the moon was created, stabilizes earth, causes seasons
Volcanic outgassing
one way water is believed water came to be on earth.
Atmosphere
gases in the atmosphere
hydrosphere
total amount of water on a planet
biosphere
Parts of earth where life exists
geosphere
The earth itself
carbon cycle
the movement of carbon within the earth
How does the carbon get from a land plant to the atmosphere and back
animals earth plants, goes up the food chain, they dire and it gets rerealesed or they exhale it.
What does a plant need for photosynthesis and what does it give out
CO2 oxygen and sunlight
Oxygen and energy and glucose
Micrometer
very very small, human hair is between 50-180 micrometers
4 eras and their approximate length
Precambrian: 4500-600 mya
Paleozoic: 600-250 mya
Mesozoic: 250-65 mya
Cenozoic: 65 mya - today
Era and order of events
Earth forms - 4567 mya
Moon forms - 4500 mya
Oldest rock - 4000 mya
Oldest evidence of life - 3850 mya
Great oxygenation event - 2400 mya
Eukaryotic life develops - 1800 mya
First land vertebrates - 375 mya
Pangea exists - 300-200 mya
First members of our genus Homo appeared in Africa - 2 mya
