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Yogita Ingle 7 years, 10 months ago
Metamorphic rocks are formed from other rocks that are changed because of heat or pressure. Earth movements can cause rocks to be deeply buried or squeezed. As a result, the rocks are heated and put under great pressure. They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks.
Sometimes, metamorphic rocks are formed when rocks are close to some molten magma, and so get heated up. Metamorphic rocks are not made from melting rock.
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Yogita Ingle 7 years, 10 months ago
Fossil fuel, any of a class of hydrocarbon-containing materials of biological origin occurring within Earth’s crust that can be used as a source of energy. The fossil fuels are coal, oil and natural gas. They are fuels because they release heat energy when they are burned. They are fossil fuels because they were formed from the remains of living organisms millions of years ago.
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Yogita Ingle 7 years, 10 months ago
There are 11 major organ systems in the human body, which include the circulatory, respiratory, digestive, excretory, nervous and endocrine systems. The immune, integumentary, skeletal, muscle and reproductive systems are also part of the human body.
The circulatory system is responsible for transporting blood throughout the body.
The respiratory system allows air to enter the lungs and for oxygen to diffuse into the blood en route to the body's tissues.
The digestive system is responsible for bringing food into the body and breaking it down to useable components.
The urinary or excretory system is where liquid waste is eliminated as urine.
The central nervous system consists of the brain and the spinal cord, which serve as the main control centers for the body and process all incoming and outgoing messages.
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