Oceans of water and continental crust were present
A) 150 000 000 years after Earth formed.
B) 2 000 000 000 years after Earth formed.
C) 15 000 000 years after Earth formed.
D) 75 000 000 years after Earth formed.
Answer: A
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A. reach the bottom of the kelvin scale of temperature. B. ever stop radiating energy. C. both of these D. neither of these
Paleoseismology estimates expected earthquake activity based on past earthquake activity
Indicate whether the statement is true or false
Possible sources of methane from human activities include all of the following except
A. rice paddies. B. extracting fossil fuels. C. raising livestock. D. wind turbines.
Earth's magnetic field reverses its polarity in irregular intervals of ________ of years
A) tens to hundreds B) hundreds to thousands C) thousands to millions D) millions to billions E) billions to trillions