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19 Cards in this Set
- Front
- Back
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How many plate tectonics?
How many small plates? How much do they move? |
•roughly 12 plates
•multiple small plates •move about 2-5 cm per year |
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What are the types of plate boundaries
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•convergant
•divergant • transform |
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What do convergant plates do?
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move toward each other creating mountains volcanoes
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What do divergant plates do?
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move apart creating new continents, oceans
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What do transform plates do?
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plates slide past each other creating fault lines and earthquakes
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What is continental drift?
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how continents move along with the plates they sit on.
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What are the 2 main theories about Pangaea.
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uniformitarianism
catostrophism |
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What is uniformitaianism?
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slow and gradually change
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What is catostrophism?
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rare and natural events, sudden change
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What is the rock cycle?
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•igneous
•metamorphic •sedimentary |
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What does the layers of rock tell you?
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The deeper layers of rock are older
fossils are usually in sedimentary rocks |
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The evidence of evolution?
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•embryology
•DNA evidence •vestigal structures •homologous structures •fossil record |
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What is a fossil record?
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•remains of traces of organisms that lived long ago
•shows past organisms different from current organisms •shows climate change |
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How are fossils preserved?
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hard remains: rocks, ambers, frozen, asphait, petrification
trace remains: tracks, burrows, dungs, mold/casts |
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What are homologous structures?
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structures that are similar in very different organisms
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What are vestigal structures
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structures that are present in organisms but no longer needed
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What is DNA evidence?
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closely realted organisms have similar DNA samples
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What is embryology?
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many organisms start developing the same way
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Embryolgy
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some evidence dont match
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