Melting snow from the rocky Mountains
1. The plates in the planet’s surface move because of intense heat in the Earth’s core, that causes molten rock in the mantle layer to move.
2. This one is simple: The <span>gravity and the rotation of the planet causes the plates to shift and move.
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Mountain hillsides is the answer<span />
C) the wavelength increases / lower pitch
Explanation:
As the train passes away from the observer at a point, the wavelength of the sound wave will increase and the pitch will become lower.
This phenomenon is known as the Doppler's effect.
The Doppler effect is the change in frequency of wave relative to an observer's position.
- The observer will hear the greatest sound when the train is at a very close proximity to him.
- The farther the separation between the observer, the lower the sound he hears.
- This implies that the pitch of the sound will decrease as the train moves away.
- The wave frequency has reduced due to an increase in the wavelength.
learn more:
Pitch and rythm in music brainly.com/question/5297114
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The process is called Exfoliation.