Term
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Definition
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Term
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Definition
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Term
| What's 3 elements release heat in the earth? |
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Definition
| u,Th,K (uranium, thorium, potassium) |
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Term
| What are the two oldest minerals in the earth? |
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Definition
| Detrital zirconia and mineral grains in ancient greenstone belts |
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Term
| What is the oldest rock on earth? |
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Definition
| Acasta gneiss (NW Canada) @ 3.96 bya |
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Term
| When did the crust become permanent ? |
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Definition
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Term
| How fast do p waves travel? |
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Definition
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Term
| What do p waves and s waves stand for? |
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Definition
| Primary and secondary waves |
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Term
| How fast do s waves travel? |
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Definition
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Term
| Difference between s and p waves when traveling through materials? |
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Definition
P waves go through solids, liquids, gasses
s waves travel only through solids |
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Term
| Which crust is thin (3-15 km thick)? |
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Definition
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Term
| Which Crust is thick (40-50km) thick ? |
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Definition
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Term
| Which crust consists of basalt and gabbro? |
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Definition
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Term
| Which crust consists of granite? |
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Definition
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Term
| What is the most outer layer of rock? |
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Definition
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Term
| What is the second most outer layer of the crust? |
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Definition
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Term
| Which sphere is also known as the low velocity zone? |
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Definition
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Term
| How does the lithosphere and asthenosphere move? |
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Definition
| A thin layer of melt separates it, moves independently of each other |
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Term
| Describe the inner core of them earth? |
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Definition
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Term
| What is the geothermal gradient? |
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Definition
| Temperature increases directly to depth |
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Term
| What is the rate of the geothermal gradient in the crust? |
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Definition
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Term
| What happens to the geothermal gradient in the mantle and core? |
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Definition
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Term
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Definition
| Movement of heat from the interior to the surface? |
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