C1.7 Our Changing Planet Flashcards Preview

GCSE Chemistry > C1.7 Our Changing Planet > Flashcards

Flashcards in C1.7 Our Changing Planet Deck (16):
1

What are the layers of the Earth?

Atmosphere, crust, mantle, inner core, outer core

2

What metals are in the core of the Earth?

nickel and iron

3

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

4

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

5

Who came up with the theory of continental drift?

Wegener

6

How did the atmosphere form in the early years of the earth?

volcanoes gave out co2, water vapour and nitrogen

7

How were the oceans formed?

the water vapour condensed to form the oceans, water collected in the holes in the crust and condensed

8

what planets was Earth similar to?

Mars and Venus

9

How was oxygen produced?

photosynthesis by micro-organisms

10

what type of molecules make up all living things?

amino acids which produce proteins

11

What elements do amino acids have in them?

carbon, hydrogen, nitrogen and oxygen

12

What energy source was used in the Miller-Urey experiemnet?

electricty to represent a lightning bolt

13

Where has the carbon dioxide gone?

photosynthesised, locked up in rocks and dissolved into the seas

14

where did nitrogen come from?

the ammonia reacted with the air to form nitrogen and water

15

How can you separate the gases in the air?

distillation

16

What are the gases in the air today?

78%nitrogen, 21%oxygen, 0.04% CO2 1%argon