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1.Cycles is a sequences of events that repeat themselves. Some cycles are very simple. For example, the seasons of the year represent a cycle in that they always repeat – Winter, Spring, Summer, Fall, and then back to Winter!

2.A material is a substance or mixture of substances that constitutes an object. ... Materials can be classified based on their physical and chemical properties, or on their geological origin or biological function.

3.An ecosystem is an ecological community comprised of biological, physical, and chemical components, considered as a unit.

4.The water cycle shows the continuous movement of water within the Earth and atmosphere. Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow. Water in different phases moves through the atmosphere (transportation).

5.The nitrogen cycle is a repeating cycle of processes during which nitrogen moves through both living and non-living things: the atmosphere, soil, water, plants, animals and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms.

6.Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2).CO2 is then taken up by algae and terrestrial green plants and converted into carbohydrates during the process of photosynthesis, oxygen being a by-product.

7.Bacteria, also called germs, are microscopic organisms not visible with the naked eye. ... Bacteria are single-celled, or simple, organisms. Though small, bacteria are powerful and complex, and they can survive in extreme conditions.

8.Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor.

9.Nitrification is the biological process in which ammonia is oxidized into nitrite, followed by a subsequent transformation of nitrites into nitrates.

10.Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

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