Our Environment Test 1

Sewage is a liquid waste which has water as its largest component along with various types of impurities like wastewater from houses is called sewage.

Global Warming is the gradual increase in the overall temperature of the Earth's atmosphere. It begins with a phenomenon called the greenhouse effect.

The outermost layer, called the crust, is solid, too. Together, these solid parts are called the lithosphere. Earth's crust is made up of hard rocks. It is the only part of the Earth that humans see

Cutting down trees on a large scale is called deforestation, which is done majorly for commercial purposes such as to start big industries by clearing the land.

In this case burning, burying and dumping will not work, as burning will cause air pollution, burying and dumping will cause land pollution. Recycling is an option which best to prevent pollution or causing any harm to environment.

A large fraction of the emitted ODSs reach the stratosphere, where they are converted to reactive gases containing chlorine and bromine that lead to ozone depletion. ODSs containing only carbon, chlorine, and fluorine are called chlorofluorocarbons, usually abbreviated as CFCs.

The plant helps to provide oxygen for animal respiration. they also maintain the balance of carbondioxide in the atmosphere. that is why forest is called 'lungs of nature'.

The mass of air surrounding the earth is known as atmosphere

Contamination unwanted substances into water is called water pollution. 

Earth—our home planet—is the only place we know of so far that's inhabited by living things. It's also the only planet in our solar system with liquid water on the surface.