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| Question | Answer |
| What is the biosphere? | The world-wide ecological system which includes all living beings and there surroundings |
| What is the water cycle? | Water evaporates from lakes etc, and rises to the atmosphere. It then condenses or cools and becomes clouds. When there's too much water in the clouds it precipitates and rains. |
| What are the states of water? | |
| Why does ice float? | It is approximately 9% less dense than liquid water. |
| What would happen if ice sinks? | It would cause the ocean to freeze and eliminate all life on earth |
| Why doesn't water heat up easily? | It needs a lot of heat energy to heat it because it can hold a lot of energy. |
| Why does hot steam burn more than boiling water? | It has a large amount of energy when it changes form gas to liquid. |
| Where does the energy needed for the water cycle come from? | The sun |
| What is the carbon cycle? | Circulation of carbon in biosphere |
| Why is CO2 important? | Plants use it to make sugars and animals and humans get energy from plants |
| Why is the the carbon cycle important? | It's the key mechanism used to change solar energy to chemical energy so living organisms can use. |
| What are decomposing organisms? | Organisms that break down dead organisms and return the energy to the soil. |
| Give some examples | 'Funguy' and bacteria, mushrooms |
| What are fossil fuels? | Natural fuels such as coal or gas, formed in long periods from the remains of living organisms. |
| How much nitrogen is in the atmosphere? | 78% of Earth's atmosphere |
| What is fixation? | Process of making nitrogen available for living things |
| What are the 3 ways nitrogen is fixed? | Lightning, biologically and industrially |
| What is the phosphorous cycle? | The cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. |
| What is weathering? | Breaking away or eroding parts of the environment around us |
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