Flashcards
CHEMISTRY MODULE 1.7
Cards in this deck (14)
- 1What are the earths layers?The core, The Mantle and The Crust.
- 2What is the size of the crust?It is very thin compared to the diameter of the earth
- 3What state is the Mantle?It behaves like a solid but is able to flow very slowly
- 4What is the size of the core?Half the radius of the earth.
- 5What is a tectonic plate?The earths crust and the upper part of the mantle that has been cracked into a number of large pieces.
- 6What is the rate that the plates move?Very slowly, around a few centimetres each year.
- 7What was Alfred Wegener's Theory in 1915?Continental drift
- 8What did his theory suggest?His idea was that the Earth's continents were once joined together, but gradually moved apart over millions of years.
- 9What was the evidence that he used?That the shapes of the coast of West Africa and South America look as thought they could fit together
Or
The fossils and rock structures in both places were similar. - 10What was the main reason that scientists found his theory so hard to believe?Because he couldn't explain how the continents moved
- 11How did the continents actually move?Deep within the earth radioactive decay produces vast amounts of energy which heats up molten minerals in the mantle which expands. They become less dense and rise towards the surface and are then replaced by cooler material. These pushed the tectonic plates over the surface of the earth.
- 12What is the thing called that pushed the tectonic plates over the surface of the Earth?Convection currents
- 13What happens at boundaries between tectonic plates?Volcanic eruptions or Earthquakes.
- 14Why can these events never be accurately predicted?Because there are so many variables which do not show any consistent patterns
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- GCSE Science (Chemistry Module 1) Flashcards on CHEMISTRY MODULE 1.7, created by Iona Diack on 27/10/2015.
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