A Cirrus cloud indicates the top of the troposphere.
Animals and plants need to get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas.
The answer is true. <span>A covalent bond is formed when atoms share electrons. </span>
