Test: Air and water- 2 - Class 1 MCQ

Living things need oxygen which is 78 % in the air . Living things need oxygen to survive because we can't survive without oxygen.

Ice is water in its frozen, solid form. Ice often forms on lakes, rivers and the ocean in cold weather. It can be very thick or very thin. It occurs as frost, snow, sleet and hail. 

The perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction.

Atmospheric water vapour frozen into ice crystals and falling in light white flakes or lying on the ground as a white layer.

Water of seas and oceans is not "fresh water"

The States of Water: solid, liquid, gas. Water is known to exist in three different states; as a solid, liquid or gas. Clouds, snow, and rain are all made of up of some form of water.

The oceans cover about 70 percent of the Earth's surface, and that about 97 percent of all water on and in the Earth is saline—there's a lot of salty water on our planet.

The toxic gases that factories release into the air, combined with those added by automobiles on the road, mean that we have an increased risk of developing chronic respiratory disease, lung cancer, heart disease and many other illnesses, diseases and conditions.

Air has no weight, since it float.
Air has no weight when it is free to move from one place to another, but it contains weight when it is filled inside any container because the air inside a container compresses by the walls of balloons, which gives weight to the air inside the balloon.

The Moon is considered not to have an atmosphere because it cannot absorb measurable quantities of radiation, does not appear layered or self-circulating, and requires constant replenishment due to the high rate at which its gases get lost into space.