Magnetic iron-bearing minerals that crystallize out of magma ____.
a. align themselves with the Earth's magnetic field and only record direction
b. record the strength of the Earth's magnetic fields
c. become easily altered and lose their magnetic properties
d. record both direction and strength of the Earth's magnetic field at time of crystallization
e. none of these
d. record both direction and strength of the Earth's magnetic field at time of crystallization
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A heavy stone is launched straight upward at 100 m/s. If air resistance can be neglected, the time to reach its maximum height is
A. more than 20 s. B. 10 s. C. 20 s. D. none of the above
The most stable layer in terms of temperature and density is the mixed layer. Indicate whether the statement is true or false
Innovations in agriculture have increased food supply. This has allowed human populations to grow to approximately ________ by the end of the agriculture period
A) 100 million B) 1 billion C) 1.5 billion D) 1 million E) 500 million
Which of the following is NOT one of the distinct biomes into which tropical forests are subdivided?
a. sclerophyllous forest b. tropical rainforest c. monsoon rainforest d. thornbush and scrub