Question

1.Why is the sky blue? The earth is surrounded by an atmosphere.
2 How much does the earth weigh?
3.What is a black hole?
4.what is the color of mirrors
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Answer 1

Answer:

1. The sky appears blue because of reflection..

Answer 2

Answer:

1. The sky appears blue because of reflection
2. Earth weighs about 13,170,000,000,000,000,000,000,000 pounds (or 5,974,000,000,000,000,000,000,000 kilograms). Since Earth is too big to be placed on a scale, scientists use mathematics and the laws of gravity to figure out Earth's weight.
3. A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
4. As a perfect mirror reflects back all the colours comprising white light, it's also white. That said, real mirrors aren't perfect, and their surface atoms give any reflection a very slight green tinge, as the atoms in the glass reflect back green light more strongly than any other colour.

Explanation:

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