ESS
Grade-10
Easy
Question
Which of the following is explained by theory of plate tectonics?
Reasons for changes in Earth’s magnetic field over a period of time.
In what way Earth and other bodies in the Solar System formed.
Why the planet’s gravitational pull changes somewhat from one place to other place on Earth.
- The source of mountains and ocean basins and the shapes of the continents on the surface of the Earth.
Reasons for changes in Earth’s magnetic field over a period of time.
In what way Earth and other bodies in the Solar System formed.
Why the planet’s gravitational pull changes somewhat from one place to other place on Earth.
Hint:
Tectonic plate theory
The correct answer is: The source of mountains and ocean basins and the shapes of the continents on the surface of the Earth.
- Formation of mountains and ocean basins and the shapes of the continents on the surface of the Earth can be explained by tectonic plates theory.
- So, the correct option is d.
- Big Bang theory explains how the universe began.
- Gravity is not same everywhere on Earth, but it varies because the planet is not perfectly spherical or uniformly dense and also due to it's rotation.
- Since the forces that generate our magnetic field are constantly changing, the field itself is also in continual flux, its strength waxing and waning over time.
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