Science Flashcards
What is the continental drift theory?
an idea that the earth’s continents have moved over geologic time relative to each other, thus appearing to have drifted across the ocean bed
How do scientists date rock samples?
geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
What is The Magnetic Field?
it is also known as the geo magnetic field.
What is a Delta?
wetlands that form as rivers empty their water and sediment into another body of water
What is Earth’s Shape?
Spherical, slightly egg shaped.
What is a focus in earthquakes?
The focus or Hyprocenter is the point underground where the fault and the epicenter intersect.
What is another name for the Dinosaur Era?
The Messosoic
What was the oldest era called?
Paleozoic
What is a Topographical Map?
A map of the physical geography of an area
What is a contour interval?
The distance between contour lines
What is a contour line?
A line drawn on a topographical map in order to show elevation or depression
What is volcanic lava made of? (Name at least 3)
silicon, oxygen, nitrogen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus and titanium
What is seafloor spreading?
A geological process in which underwater tectonic plates are moved apart
What is Basalt?
Extrusive igneous rock.
What class of rock is clay?
Sedimentary
What sedimentary rock makes diamonds?
Coal
What class is granite?
Igneous
What is loam?
The bottom will be sand, middle will be silt, top will be clay
What is mica?
Metamorphic & igneous
What is mudstone?
Sedimentary
What is obsidian?
Igneous extrusive rock
What is Quartzite?
Metamorphic
What does sand make?
Sedimentary rock
What are cumulus clouds?
cauliflower shaped clouds usually spotted in fair weather conditions