If seafloor spreading creates new lithosphere, does the size of Earth change?
A) Yes, Earth is getting larger.
B) No, the extra crust is crumpled up to form mountains.
C) No, older crust is recycled back into the asthenosphere.
D) Yes, the Earth is shrinking because it is cooling.
Answer: C
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In 2014, when scientists used a laser to simulate the conditions generated when a large impact hits a mixture of prebiotic molecules, they were able to produce
A) all 20 amino acids used in life B) all four DNA bases used in life C) complex carbohydrates D) simple proteins
On a winter day the temperature is 5 degrees Celsius and the humidity is 0.003 kilograms per cubic meter. (a) What is the relative humidity? (b) The air is brought into a building and heated to 20 degrees Celsius without changing the humidity. What is the relative humidity inside the building?
Tides occur later each day because of
a. Earth's rotation with respect to the Sun. b. the Moon's rotation with respect to Earth. c. Earth's rotation with respect to the Moon. d. a change in gravitational attraction.
The ground state electronic configuration for silicon is 1s22s22p63s23p2 . Which of the following elements would be expected to be chemically similar to silicon?
a. boron with configuration 1s22s22p1 b. lithium with configuration 1s22s1 c. carbon with configuration 1s22s22p2 d. sodium with configuration 1s22s22p63s1