Which of the following types of volcanic eruption have occurred on Mount St. Helens since it began erupting in 1980?
A) Eruption column
B) Pyroclastic flow
C) Volcanic dome
D) All of these are correct.
D) All of these are correct.
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Why is Mount Etna in Sicily an important place for geology?
A) It is very calm, showing the serenity of the earth. B) It is a famous underwater volcano. C) It is a famous mountain for geologists to climb. D) It is an active volcano, showing that the earth is a dynamic place.
North Africa has three main climate types: desert, steppe, and
A) dry summer subtropical B) marine west coast C) tropical rainy D) humid continental, warm summer
The atomic number of an atom is equal to which of the following?
A) the number of protons in the atom B) the number of neutrons in the atom C) the total number of protons and neutrons in the atom D) the total number of protons, neutrons and electrons in the atom
A comet's tail points ________.
A. toward the Sun B. in the direction it came from C. away from the Sun D. in the direction it is going