The blanket of air that surrounds the earth is called the atmosphere. Ozone layer is a part of stratosphere which protects us from harmful UV rays of sun.

The Earth completes one revolution around the Sun in about 365 days or 1 year.

The Equator is an imaginary line drawn to divide the earth into equal hemispheres called Northern and Southern hemisphere.

The process by which wind or flowing water washes away the top part of soil is known as soil erosion. Deforestation, farming and over-grazing lead to soil erosion.

Air is a mixture of gases containing $78\%$ of nitrogen, $21\%$ of oxygen and $1\%$ of other gases including carbon dioxide. Carbon dioxide gas is essential for the synthesis of food in green plants.

The Equator divides the Earth into equal upper and lower half called Northern and Southern hemispheres.

A herbivore is an animal that eats only plants for survival. E.g. Deer, Goat, Rabbit etc.

 An animal that hunts, kills and eats other animals is called a predator. E.g Tiger, Lion etc 

The cool air of sea moves toward warm land during daytime due to the pressure difference created between them.

Igneous rocks are formed through the cooling of magma or lava. Rocks like granite and basalt are formed when magma cools above the surface of the earth.