Question

Presence of which of the following makes the earth a unique planet?
a. Water
b. Atmosphere
c. Gravitational force
d. All of the above

Answer 1

Hint:
Earth is the third planet from the sun and the only astronomical object that hides life. Earth consists of earth, air, water and life. The earth contains mountains, valleys and flat areas. Air is made up of various gases, especially nitrogen and oxygen. Water includes oceans, lakes, rivers, streams, rain, snow, and ice.

Complete solution:
Water: Earth has a lot of water, but unfortunately only a small portion (about 0.3 per cent) that even humans can use. The remaining 99.7% is in the oceans, floors, ice caps and swimming in the atmosphere. Most of the 0.3 percent used, however, cannot be achieved. Most of the water that humans use comes from rivers. The visible waters are called surface water. Most of the freshwater is found underground as soil moisture and aquifers. Groundwater can provide water flow so that rivers can continue to flow even though it is not raining. Humans can use groundwater and surface water.
Atmosphere: Earth's atmosphere is a layer of gas called air which is trapped by Earth's gravity. it circles the planet Earth and forms the planet's atmosphere. Earth's atmosphere protects life on earth by creating a pressure that allows liquid water to reach the earth's surface, absorbs solar ultraviolet radiation, warms the surface by storing heat (greenhouse effect) and reduces the extreme temperatures between day and night.
Gravity force: Earth's Gravity is very important for our daily life. It is the gravity of the sun that keeps the earth in orbit around the sun. Life on earth needs sunshine and warmth to survive. Gravity helps the earth be at the correct distance from the sun so that it is neither too hot nor too cold.

Hence, the correct answer is option A.

Note:
Earth has a strong magnetic field. This phenomenon is caused by nickel iron in the core of the planet as it rotates rapidly. This field protects the earth from the influence of the solar wind. Earth is the densest planet in the solar system. This varies depending on the part of the planet. For example, a metal core is thicker than the crust. The earth's average density is approximately 5.52 grams per cubic centimetre.