Answer:
Earth has earthquakes because of the plate tectonics that move underneath earths surface.
Explanation:
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Answer:
Erosion is a geological surface process described as <u>the weathering and sorting of rock and soil.</u>
Explanation:
Erosion -
The geological process by which the earthen material like rock and soil are worn away or carried away by natural forces , which can be wind or water , is called Erosion.
Erosion is exactly opposite to the process of deposition , the geological process of depositing earthen material is called deposition .
Hence,
Erosion is a geological surface process which is described as -
the weathering and sorting of rock and soil.
C= Geography
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Answer:
b. flat rotation curves in spiral galaxies
Explanation:
Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.
Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.
The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.
Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.
