Across
- 4. describes how nitrogen moves between plants, animals, bacteria, the atmosphere (the air), and soil in the ground.
- 6. part of the decaying process. When a plant or animal dies, decomposers like fungi and bacteria turn the nitrogen back into ammonium so it can reenter the nitrogen cycle.
- 9. Energy from the sun heats up the surface of the Earth, causing the temperature of the water in our rivers, lakes and oceans to rise.
- 10. the first step in the process of making nitrogen usable by plants. Here bacteria change nitrogen into ammonium.
- 11. Extra nitrogen in the soil gets put back out into the air. There are special bacteria that perform this task as well.
- 12. used as fertilizers in agriculture.
- 13. Plants and trees also lose water to the atmosphere through their leaves.
Down
- 1. a way that water moves all around the Earth.
- 2. help the nitrogen change between states so it can be used
- 3. The fallen precipitation is then “collected” in bodies of water – such as rivers, lakes and oceans – from where it will eventually evaporate back into the air, beginning the cycle all over again.
- 5. As water vapour rises up high into the sky, it cools and turns back into a liquid, forming clouds.
- 6. how plants get nitrogen. They absorb nitrates from the soil into their roots. Then the nitrogen gets used in amino acids, nucleic acids, and chlorophyll.
- 7. the process by which ammonium gets changed into nitrates by bacteria. Nitrates are what the plants can then absorb.
- 8. When too much water has condensed, the water droplets in the clouds become too big and heavy for the air to hold them.