Earth and Atmosphere Flashcards
What are the layers of the earth from out to in?
Crust Mantle Core
What happens at plate boundaries?
Tsunami Mountains Volcanoes Earthquakes
Where do Earthquakes come from?
Tectonic plates Rub against each other
Why do tectonic plates move?
Convection currents In the mantle caused by radioactive decay in the core
What causes convection currents in the mantel?
Radioactive decay in core
Why are earthquakes hard to predict?
Equipment may be wrong, Don’t know how big, Many little earthquakes, Do not know how the mantle is moving,
How has the Earth’s atmosphere changed from when it was first formed?
Less CO2, less water vapour, More Oxygen, More Nitrogen
3 processes that release carbon dioxide
Burning fossil fuels, decaying matter, respiration, Deforestation
3 processes that take in carbon dioxide
Dissolve in ocean, Locked up in sedimentary rock, locked up in fossil fuels, locked up in plants
How did the Earth’s atmosphere form?
Gases released through volcanic activity
How did the Oceans from?
Condensation of water vapour in the atmosphere
What are Wegner’s evidence for continental drift?
Land bridge between S America and Africa, Similar Fossils, Similar plants
Why wasn’t Wegner’s theory accepted at the time?
Lacked Evidence, They already had other theories
