C. Give reasons for the following:
1. The earth is the only habitable planet.
2. The earth's shape is Geoid.
3. The earth is the home of humankind.
Answers
Answer:
1. It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon. The processes that shape the Earth and its environment constantly cycle elements through the planet. This cycling sustains life and leads to the formation of the mineral and energy resources that are the foundation of modern technological society.
2.The geoid is a shape like the surface of the Earth. It is a 3-D geometrical shape like an orange. Shapes of this kind are called oblate spheroids, which is a kind of ellipsoid.
The geoid, however, is a very special kind of oblate spheroid. It is defined as follows:
The geoid is the shape that the surface of the oceans would take under the influence of Earth's gravitation and rotation alone, in the absence of other influences such as winds and tides.
3. same as 1.