Question

B. Explain the following terms :
1. Terrestrial planets
2. Oxygen cycle
3. Unique planet
4. Water Cycle
5. Biosphere




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Answer 1

Answer:

                     Terrestrial planets

A terrestrial planet refers to a planet (celestial body) that is made up of silicate rocks or metals. ... Terrestrial planets are known to have few or no satellites of their own. For example: Earth has only one satellite, Mars has two, whereas Mercury and Venus have none.

                           Oxygen cycle

The oxygen cycle is the cycle that helps move oxygen through the three main regions of the Earth, the Atmosphere, the Biosphere, and the Lithosphere. The Biosphere is the sum of all the Earth's ecosystems. ... This also has some free oxygen produced from photosynthesis and other life processes.

                            Unique planet

Earth is called as a unique planet because it is the only planet known that supports life. It has the moderate climatic conditions favouring life. It is also beautiful with so many types of flora and fauna and so many types of species.It has all types of geographical features and the living beings adapt.

                         Water Cycle

The water cycle is the path that all water follows as it moves around Earth in different states. ... Water vapor—a gas—is found in Earth's atmosphere. Water can be found all over Earth in the ocean, on land and in the atmosphere. The water cycle is the path that all water follows as it moves around our planet.

                           Biosphere

The biosphere is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients. Earth's environmental spheres.

Explanation:

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Answer 2

Answer:

1.terresterial planets- the planets that are composed primarily of silicate rocks or metal are called terresterial planets.

2.oxygen cycle- the circulation of oxygen in various forms through nature is called oxygen cycle.

3.unique planet- the planet which is unique from all the other planets and which supports life is called a unique planet.

4.water cycle- the continuous cycle of processes by which water from the earth's surface is evaporated and reached to the atmosphere and then again comes back to the earth through precipitation is called water cycle.

5.biosphere- the part of the earth's surface and atmosphere in which life forms exist is called biosphere.