1. what are meteorites?
- a meteorite is a solid piece of debris from a source such as an asteroid or a comet, which originates in outer space and survives its impact with the earth's surface. it is called a meteoroid before its impact, a meteorite's size can range from S-XL
- unidentified rocks on earth
- a heavy rock that comes from space
- parts of the moon
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2. explain how the atmosphere has changed to contain oxygen
- life evolved to form single-celled organisms which started to photosynthesise
- trees grew and produced oxygen
- oxygen was suddenly released from within the earth
- natural disasters eventually created oxygen
3. what happens at plate boundaries?
- there is no way of telling where the boundaries are
- various natural disasters
- at the plate boundaries there tends to be volcanoes and earthquakes occurring due to the movement of the plates
- there are huge ravines where the plates have moves away from each other
4. what are deep sea vents? (hydrothermal vents)
- 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 place where only some animals can live
- a deep gap in the sea floor
- a heated gap in the sea filled with water
5. 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