Most waves in the electromagnetic spectrum are
A. invisible.
B. blue light.
C. red light.
D. green light.
Answer: A
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A vibrating bob at the end of a vertical spring completes a cycle every 2 s. Its period is
A. 1 s. B. 0.5 s. C. 2 s. D. more than 2 s.
Why is the lower mantle thicker than the upper mantle?
What will be an ideal response?
What type of eruption formed the volcano in this photograph?
A. viscous lava and pyroclastic eruptions B. fissure eruptions C. fluid lava flows D. eruptions beneath the seafloor E. lava fountains
Which of the following is TRUE concerning the deepest part of the ocean?
A) The bottom of this trench has never been reached by a submersible. B) The deepest part of the ocean is located in a trench off the coast of Japan. C) The depth of this trench exceeds the height of Mount Everest. D) The depth of this trench is estimated at 15,000 meters. E) This trench is called the Philippine Trench.