b. What is water energy? How is it related to hydroelectricity?
c. What is the difference between rotation and revolution of the Earth?
d. What is meant by biodegradable and non-biodegradable wastes? Explain wit
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Answer:
b.) Hydropower uses a fuel—water—that is not reduced or used up in the process. Because the water cycle is an endless, constantly recharging system, hydropower is considered a renewable energy. When flowing water is captured and turned into electricity, it is called hydroelectric power or hydropower.
c.) Rotation and Revolution
"Rotation" refers to an object's spinning motion about its own axis. "Revolution" refers the object's orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day. Earth revolves about the Sun, producing the 365-day year.
d.) A biodegradable substance can be defined as a material which can be decomposed by microorganisms or decomposers and not be adding to any type of pollution. Waste that cannot be decomposed by the biological ways is called the Non-biodegradable wastes.