Answer:
We study about the sun because  
The sun is a normal star. It is much closer to us than any other star, and by studying the sun, we can therefore learn more about other stars. The better we understand other stars, the more we know about the Milky Way. From there we know more about other galaxies and in the end we learn more about the universe.
Explanation:
How does the Sun help to protect life on Earth? 
It radiates light and heat, or solar energy, which makes it possible for life to exist on Earth. Plants need sunlight to grow. Animals, including humans, need plants for food and the oxygen they produce. Without heat from the sun, Earth would freeze.
 
        
             
        
        
        
Venus can come closest to the earth in its orbit and look brightest in our skies.
Venus is extremely bright because it is the nearest planet to Earth and because most of the sunlight that reaches it (about 70%) is reflected back into space by its thick clouds. The brightest object in the sky, Venus is frequently seen within a few hours after sunset or before sunrise.
The Earth and Venus is 38 million kilometres away at the closest point of opposition. This is the planet's closest approach to Earth. Venus has never travelled more than 261 million kilometres from Earth. the fact that the distance between Venus and Earth may change by a staggering 223 million kilometres.
To learn more about Venus refer
brainly.com/question/22681445
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Answer:
Pushing and pulling
Explanation:
We are on tectonic plates that pull, push, and crash into each other at various intervals everyday.
 
        
                    
             
        
        
        
Answer:
Tectonic Activities in the plates are responsible for the sharp shape of Earth's mountain.
Explanation:
Mountains on the earth are form because of the tectonic activities. Basically FOLD MOUNTAINS are more sharp because they are young and less eroded.
Fold mountains form when two tectonic plates collide with each other, both the plates are light in weight so no plate is ready to go downward, But because of speed and density difference one plate ob duct( obduction is word used for the submergence of continental plate as subduction in case of oceanic plates.). And the plate which is under pushes the upper plate which gives extra push to the mountains formation and result as a sharp peak mountains.
EX:- Himalaya, Andes.
 And No such tectonic process takes place on the moon so mountains on moon are once formed and now they are eroding.