Water Cycle

Nitrogen Cycle

1. The atmosphere is 80% nitrogen: why do you think plants and animals can't use nitrogen as it is found in the atmosphere? Plants and animals can't use nitrogen because it cannot absorb nitrogen in its gaseous form.       

2. Explain what is meant by nitrogen fixation. Nitrogen Fixation occurs when bacteria convert nitrogen gas into organic compounds that living organisms can take up.           

3. What is the role of bacteria in the nitrogen cycle? it fixes the nitrogen released by lightning strikes           

4.Why don't legumes need nitrogen-containing fertilizers? because legumes provide the bacteria with energy-rich carbohydrates so it don't need fertilizers  

5.Why is nitrogen so important for living things? Nitrogen is important for living things because it is a key building block in a number of important molecules, such as nucleic acids, amino acids, and proteins  

6. What are the processes involved in the nitrogen cycle? Nitrogen Fixation, Decomposition, Ammonification, Assimilation, Dentrification, and 

Nitrification.              

Layers of the Atmosphere

Answers:

1. It is because each layer has different characteristics, and it has also different altitude and density that make it separated.

2. The temperature increases in the Stratosphere because of the high concentration of ozone in the Stratosphere. Ozone absorbs ultraviolet radiation from the sun and converts the energy into heat, causing air temperature increase.

3. Airplanes cannot fly in the Mesosphere because air pressure and density in the Mesosphere are extremely low.

4. The temperature in the Thermosphere depends on how the oxygen absorbs ultraviolet radiation from the sun.

The Lorax (answers)

Answers: 

1. The Once-ler cut all the trees in their ecosystem.

2. The animals and other living things left the place.

3. The business affect the livings things because it loss their habitat.
4. We must care, respect and protect our environment because these make us live and it is God's creation.

Energy Flow

ANSWERS:

1. Plants get their energy from the sun.
2. Photosynthesis
3. It goes into building and operating the plant itself
4. 10% of energy the plant captures
5. The energy makes the cow warm, to produce and power its muscle cells and to take care of other needs.
6. 10%
7. For heating and operating the body
8. It helps us because only 10% of the energy in an animal's food winds up in the meat you eat.
9. It can help us grow, think or do anything else.