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 consisting most nearly means ________.

Câu hỏi liên quan

• In the second paragraph, the word “stored” is closest in meaning to _________.

• The word "hyperactive" is closest in meaning to _____.

• What can the word adorning be best replaced by?

ZUNIA12

• The passage mainly discusses costume in terms of its _______

• The word “employment” in line 4 refers to the ......

• What does the passage mainly discuss?

• Of the following steps, which occurs BEFORE the others in making a decision worksheet?

• According to the passage, what are children NOT usually taught outside the classroom?

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

• How would the author probably characterize the people who are mentioned in the first line of the second paragraph?

• According to the passage, where are hummingbirds found?

• The main subject of the passage is_________.

• What can be inferred from the passage about the adult parents of the young great horned owls?

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

• Who were the subjects of the study?

• According to the passage, what must the nations of the world do to find a solution?

• In the first paragraph, Bradstreet, Warren, and Adams are mentioned to show that ...........

• The word “it” in paragraph 2 refers to ................

• What is the last paragraph mainly about?

• What can be inferred about babies from this passage?