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 main idea of this passage is that ________.

What does the passage mainly discuss?

The author mentions the “ shoesbox under the bed” in order to ................

Which of the following is NOT true according to the text?

What can the word invokes be best replaced by?

Approximately when did English begin to be used beyond England?

The passage suggests that the tsunami resulting from the Krakatoa volcano .....

The word "it" in bold in paragraph 2 refers to ............

Throughout the passage, the author implies that the Mandans _____.

Which of the following is NOT mentioned about John Harvard?

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

The Asiatic lion ............

According to the passage, Moby Dick is__________.

The word “fragile” in paragraph 4 is closest in meaning to .........

The word “Conversely” is OPPOSITE meaning to ...............

Extreme weather can be caused by ...............

According to the passage, what causes the unique color and look of hummingbirds?

It may be inferred from the passage that Pippin .............

The author states that "On the average, people can keep about seven ideas in their minds at once" (paragraph 3) to explain that .....

The changes possibly caused by the cellphones are mainly concerned with ______.

The author implies that in the 1920’s and 1930’s home deliveries of ice _________ .