Earth's rotation axis is approaching Polaris today
a. True
b. False
Indicate whether the statement is true or false
True
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Why don't most of the particles that make meteors actually reach the surface of Earth?
A) They are too small and burn up in the atmosphere. B) They reflect off the atmosphere and return to space. C) They are too small and are slowed to a stop in the atmosphere. D) They are deflected by the solar wind. E) They are deflected by the gravity of the Moon.
Scientist use the term "blackbody" to indicate a surface that will not emit any color of visible light.
Answer the following statement true (T) or false (F)
Percival Lowell’s claims of a Martian civilization generated great public interest, but other scientists of his time were highly skeptical of these claims. Which two of the following statements (which are all true) explain why other scientists of the late 19th and early 20th centuries rejected Lowell’s claims?
a. Lowell’s canals did not appear in photographs of Mars taken through telescopes. b. Lowell’s canals followed perfectly straight lines for thousands of kilometers. c. Mars has an axis tilt very similar to Earth’s axis tilt. d. Like Earth, Mars has polar ice caps. e. Mars rotates with a period only a little longer than Earth’s rotation period.
Whenever water evaporates,
A) heat is absorbed. B) heat is released. C) temperature rises. D) clouds form.