Molten rock material on Earth's surface is called
a. magma.
b. lava.
c. pluton.
d. silica.
b
You might also like to view...
If you wanted to observe stars behind a molecular cloud, in what wavelength of light should you observe?
A) ultraviolet B) visible C) infrared D) x-ray E) gamma ray
Centrifugal forces are
A. Real. B. Fictitious. C. Real if we are in a rotating frame.
After a star leaves the main sequence, ________.
A. all hydrogen in the star has been fused, and helium fusion begins B. it now fuses hydrogen into helium in a shell outside the core C. it continues to fuse hydrogen into helium in its core D. it no longer fuses hydrogen into helium anywhere inside the star
If an atom's atomic number is given by Z, its atomic mass by A, and its neutron number by N, which of the following is correct?
A) N = A + Z B) N = Z - A C) N = A - Z D) N = 2A + Z E) N = A + 2Z