Question | Answer |
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. |