As viewed from space, Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million kilometers (93 million miles), Earth is the third planet from the Sun and the fifth largest planet in the solar system.

   Our planet’s rapid spin and molten nickel-iron core give rise to an extensive magnetic field which, coupled the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Earth’s atmosphere protects us from meteors as well, most of which burn up in the Earth’s atmosphere before they can strike the surface. The planet active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it formed about 4.6 billion years ago. The Earth has a single natural satellite – the moon.

The word distinguishing as it is used in this selection means ________.

Câu hỏi liên quan

• According to the passage, the depression of the 1930's caused which of the following?

• The word "symptoms" is closest in meaning to______________.

• In the second paragraph, the pronoun "them" refers to which of the following?

ZUNIA12

• The word “clogged” is most likely to correspond to ............

• The word “them” means .......

• When was M.L. born?

• The word "odd" is closest in meaning to ........

• If you have a desire to travel, when does the writer suggest that you do it?

• According to the passage, why do people join groups that practice secondary cooperation?

• The word "fascinating" in the second paragraph could be replaced by ...............

• How many Americans are involved in telecommuting?

• Which of the following is TRUE according to the passage?

• The word "fine" in the passage is closest in meaning to ______.

• According to the passage, to learn new information, low-achieving students do NOT .............

• The word "fused" in line 2 is closest in meaning to .......

• The word “reluctant” in line 13 can best be replaced by ________.

• Which of the following is the main subject of the passage?

• We sometimes think of writing as more real than speech because ..................

• The underlined word “refrains” in paragraph 2 is closest in meaning to ......

• Which of the following statement is TRUE about the passage?