Life on earth depends on the sun. Day after day we see its light and feel its

游客2023-09-15 45

问题 Life on earth depends on the sun. Day after day we see its light and feel its 【B1】 , but we do not often know or 【B2】 the birth or the beginning of their 【B3】 . Yet there are amount of 【B4】 things about the sun. One is its distance from the earth. This is about ninety-three 【B5】 miles. It is to us, a long distance. A 【B6】 of this distance, even if it could be made, would take 【B7】 hundred years even in the 【B8】 rocket.
The sun makes us feel heat, even at a distance of ninety-three million miles. This is not surprising. 【B9】 . But we receive only a small part of this heat. The total heat of the sun could melt a column of ice two and a quarter miles thick and ninety-three million miles high in one second.
The brightness of the sun is equally astonishing. As we said earlier, we receive only a very small part of the sun’s heat. 【B10】 This is sufficient for the growth of trees and plants, and for the existence of living creatures on earth. 【B11】 . The heat and light from the sun come in just the right quantities for life on earth.

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