4. How is aurora formed?
1. Describe the importance of the Earth's atmosphere.
2. Explain the composition of the atmosphere.
3. Justify the statement: 'Atmosphere of the Earth is held together by gravitational terece
4. Write short notes on:
b. Mesosphere
a. Exosphere
Answers
Answer:
4.As solar wind approaches the Earth, it meets the Earth's magnetic field. ... In the ionosphere, the ions of the solar wind collide with atoms of oxygen and nitrogen from the Earth's atmosphere. The energy released during these collisions causes a colorful glowing halo around the poles—an aurora.
1. The atmosphere is made of gases that are essential for photosynthesis and other life activities. atmosphere is a crucial part of the water cycle. It is an important reservoir for water, and the source of precipitation. The atmosphere moderates Earth's temperature
2. Composition of air
Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent. Carbon dioxide — 0.04 percent
3 . Earth's gravity is strong enough to hold onto its atmosphere. Mars, for example, is less than half Earth's size and around one-tenth Earth's mass. Less mass means less gravitational pull. ... That means, the air nearer Earth's surface is squished by the air above it, and is thus denser.
4a. The mesosphere is the third layer of the atmosphere, directly above the stratosphere and directly below the thermosphere. In the mesosphere, temperature decreases as altitude increases.
4b. The exosphere is the outermost layer of the Earth's atmosphere. It starts at an altitude of about 500 km and goes out to about 10,000 km. Within this region particles of atmosphere can travel for hundreds of kilometers in a ballistic trajectory before bumping into any other particles of the atmosphere.
I hope my answer helps you☺☺
Answer:
Explanation:
In the ionosphere, the ions of the solar wind collide with atoms of oxygen and nitrogen from the Earth's atmosphere. The energy released during these collisions causes a colorful glowing halo around the poles—an aurora. Most auroras happen about 97-1,000 kilometers (60-620 miles) above the Earth's surface