Year 7 - Plate Tectonics and the Atmosphere

Which of the following substances is found in the Earth's atmosphere?

• aluminium

• gold

• nitrogen

• zinc

What percentage of the Earth's atmosphere is carbon dioxide?

• less than 1%

• 1%

• more than 1%

Which word is used to describe a substance that contains two or more different substances which are not chemically combined?

• Compound

• Mixture

• Element

• Metal

The atmosphere is...

• the space that exists between Earth and the Sun

• all the living organisms within an ecosystem

• a layer of gases that surrounds a planet

• a layer of oxygen near the surface

What is the approximate percentage of oxygen in the Earth's atmosphere?

• 78%

• 21%

• 1%

• 0.04%

Which is the most abundant (the most common) gas in the Earth's atmosphere?

• nitrogen

• carbon dioxide

• argon

• oxygen

What molecule does the atmosphere contain as a vapour (gas), as well as in the liquid and solid states?

• nitrogen

• water

• carbon dioxide

• oxygen

Why is it difficult for humans to breathe enough oxygen at high altitudes (on top of Mount Everest, for example)?

• the air pressure is too high at high altitudes

• there is too much nitrogen

• there are fewer oxygen molecules per volume of air

• air is more dense at high altitudes

Volcanoes are formed ... (choose two)

• when tectonic plates collide and one plate is pushed beneath another

• when tectonic plates move around each other

• when tectonic plates move away from each other

• when tectonic plates remain still

Tectonic plates move, because...

• they are moved by the convection currents in the atmosphere.

• they are moved by the convection currents in the inner core.

• they are moved by the convection currents in the mantle.

• they are moved by the convection currents in the outer core.