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Earths test

QuestionAnswer
What are the three types of boundaries? Divergent,Transform and Convergent
Describe the theory of plate tectonics? Explains the formation, movement and Subduction of Earth's plates. Movement by Convection Currents in the Mantle.
Describe the process of sea-floor spreading. Molten Material comes out of earth's mantle and creates new oceanic crust from a mid-ocean ridge. Old crust gets pushed back into the Mantle in a deep ocean trench. That is called Subduction.
What is evidence of sea-floor spread. Molten Material, Magnetic Stripe and Drilling Samples.
What occurs at deep ocean trenches. Subduction
How is convection currents related to Subduction. They are both go down.
Explain why the ocean floors are shrinking/expanding. Water going under Continents
Whats Continental Drift. 'Pangaea' was broken apart over time and drifting away slowly.
Whats Pangaea. 'all land' (one large mass of land 300 million years ago) (supercontinent)
What are fossils. preserved remains/ traces of living things.
Who was Alfred Wegener and what was his Hypothesis about continents. A geologist, continents were once joined together. Then drifted apart called continental drift.
What was Alfred Wegener's evidence. Land features, Fossils, Climates
Why was Wegener's hypothesis rejected? He couldn't explain the force for continental drift.
What are the three types of heat transfer. Radiation, Conduction and Convection
What causes convection currents? Gravity, Heat source and Density
How does density affect a convection currents? Making it mire dense.
What causes convection currents in the mantle? heat coming from the core and rising up and cooling back down.
What is the source that drives convection currents in the mantle? The Core.
What the 4 main layers of earth Crust, mantle, inner core, outer core.
Characteristics for each layer. Crust 40-70 miles thick, Mantle 1,800 miles thick, inner core 800 miles thick and outer core 1,400
Where are the layers located. Draw pic Crust, mantle, outer core, inner core
2 types of evidence geologist use to learn about earth's interior. Direct and Indirect evidence.
What types of rocks found in parts of the crust. igneous, metamorphic, and sedimentary
compare, contrast lithosphere and asthenosphere. lithosphere hard, asthenosphere bendy like rubber.
Created by: collinpanko