Which of the following is not true of calderas?
A) They are produced by removal of easily eroded pyroclastic materials.
B) They commonly contain layers of volcanic ash and volcanic domes.
C) They are bounded by steep topographic scarps with a generally basin-shaped outline.
D) They form from the collapse of the ground surface into an emptied magma chamber below.
A) They are produced by removal of easily eroded pyroclastic materials.
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Why is it so easy for a magnesium atom to lose two electrons?
A. There are lots of electron-electron repulsions that go on within the valence shell. B. The nuclear charge of the magnesium atoms is relatively weak. C. These two electrons are found relatively far from the nucleus. D. These two electrons are well shielded from the nuclear charge.
An approaching wave cyclone would be indicated by a ________ barometer reading
A) high B) variable, rising then falling C) slowly rising D) very low E) rapidly falling
Which of the following is true of a voltaic cell?
A) The anode is the negative electrode and place where reduction occurs. B) The anode is the negative electrode and place where oxidation occurs. C) The cathode is the negative electrode and place where reduction occurs. D) The cathode is the negative electrode and place where reduction occurs.
________ influences the velocity of a river along with gradient.
A. Latitude of the river B. Direction of flow C. Chemistry of the water D. Channel shape and roughness E. Temperature of the water