C1.7 Our Changing Planet Flashcards
What are the layers of the Earth?
Atmosphere, crust, mantle, inner core, outer core
What metals are in the core of the Earth?
nickel and iron
What evidence is there that South America and Africa were once linked?
rocks of similar structure, fossils showing same reptiles and plants on coast, fit together
How do the tectonic plates move?
radioactive atoms decay in the core which creates vast amounts of energy, heats the mantle and creates convection currents
Who came up with the theory of continental drift?
Wegener
How did the atmosphere form in the early years of the earth?
volcanoes gave out co2, water vapour and nitrogen
How were the oceans formed?
the water vapour condensed to form the oceans, water collected in the holes in the crust and condensed
what planets was Earth similar to?
Mars and Venus
How was oxygen produced?
photosynthesis by micro-organisms
what type of molecules make up all living things?
amino acids which produce proteins
What elements do amino acids have in them?
carbon, hydrogen, nitrogen and oxygen
What energy source was used in the Miller-Urey experiemnet?
electricty to represent a lightning bolt
Where has the carbon dioxide gone?
photosynthesised, locked up in rocks and dissolved into the seas
where did nitrogen come from?
the ammonia reacted with the air to form nitrogen and water
How can you separate the gases in the air?
distillation
