1. what are the 3 main gases in our atmosphere today?
- oxygen, nitrogen and carbon dioxide
- carbon, oxygen and carbon monoxide
- nitrogen, oxygen and hydrogen
- oxygen, hydrogen and carbon dioxide
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2. why have carbon levels been increasing?
- the burning of fossil fuels is adding carbon dioxide to the atmosphere faster than it can be removed. This means that the level of carbon dioxide in the atmosphere is increasing, contributing to global warming.
- there are too many people being born causing more carbon dioxide to be released into the atmosphere
- not enough trees are being grown to take in the carbon dioxide and release oxygen
- modern machinery requires carbon to function
3. what is the carbon cycle?
- the carbon cycle shows how carbon reacts with different metals
- the carbon cycle shows how carbon is moved from place to place around the earth
- the carbon cycle shows how the body releases carbon dioxide
- the carbon cycle shows how volcanoes are created
4. what are deep sea vents? (hydrothermal vents)
- a place where only some animals can live
- a hydrothermal vent is a fissure in planet's surface from which geothermally heated water issues. hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins and hotspots.
- a heated gap in the sea filled with water
- a deep gap in the sea floor
5. what happens at plate boundaries?
- at the plate boundaries there tends to be volcanoes and earthquakes occurring due to the movement of the plates
- various natural disasters
- there are huge ravines where the plates have moves away from each other
- there is no way of telling where the boundaries are