Which of the following is the era sometimes called the age of reptiles?
a. Mesozoic
b. Paleozoic
c. Cenozoic
d. Phanerozoic
a
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While none yet exist, in the very distant future, black dwarfs will comprise the majority of the "normal matter" of the universe
Indicate whether the statement is true or false
What happens to the rate of most chemical reactions as the temperature decreases?
A) the rate of reaction drops rapidly B) the rate of reaction drops only slightly C) the rate of reaction increases rapidly D) the rate of reaction stays the same
Let the orbital radius of a planet be R and let the orbital period of the planet be T. What quantity is constant for all planets orbiting the sun, assuming circular orbits?
A) T3/R2 B) T/R2 C) T2/R D) T/R E) T2/R3
Humans have existed on Earth for about _____
A) 4 million years B) 5 million years C) 6 million years D) 7 million years