The giant Borealis basin around the Martian north pole may have formed due to an impact with an asteroid twice the size of Ceres
Indicate whether the statement is true or false
TRUE
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There are three ________ of elementary particles in the standard model.
Fill in the blank(s) with the appropriate word(s).
The Saros cycle
a. was used in ancient times to predict eclipses. b. is 18 years, 11 days long. c. accounts for the tides seen on Earth. d. was used in ancient times to predict eclipses and is 18 years and 11 days long, e. None of the other choices are correct.
A steel sphere sits on top of an aluminum ring. The steel sphere (? = 1.10 × 10^?5/C°) has a diameter of 8 000 cm at 0°C. The aluminum ring (? = 2.40 × 10^?5/C°) has an inside diameter of 7 991 cm at 0°C. Closest to which temperature given will the sphere just fall through the ring?
a. 47°C b. 102°C c. 87°C d. 108°C e. 65°C
Why do scientists say that evolution is a "theory"?
A) because it explains a great deal about life and is supported by an enormous body of evidence B) because they are not very confident that it really happened C) because it is supported by only a small amount of evidence D) because it's really just a guess about how life developed on Earth