Active Volcanos!

Eugene K asked:


1. The youngest rocks on the ocean floor are located ____.

near continents

at mid-ocean ridges

far from mid-ocean ridges

near Asia

2. The presence of the same ____ on several continents supports the hypothesis of continental drift.

fossils

rocks

neither a nor b

both a and b

3. The boundary between two plates moving together is called a ____.

divergent boundary

convergent boundary

transform boundary

lithosphere

4. Bands of rock on the seafloor showing alternating magnetic orientation indicate Earth’s magnetic field has ____.

reversed itself in the past

weakened

become stronger

remained the same

5. Scientists believe that differences in ____ cause hot, plastic-like rock in the asthenosphere to rise toward Earth’s surface.

density

magnetism

weight

composition

6. Active volcanoes are most likely to form at ____.

transform boundaries

divergent boundaries

the center of continents

convergent oceanic–continental boundaries

7. Earthquake waves are called ____.

seismic waves

convergent waves

divergent waves

wave amplitudes

8. Which statement is true of P-waves?

They travel the fastest through rocks.

They vibrate at 90° to the wave motion.

They are last to reach the epicenter.

They are the most damaging.

9. The Richter scale is based on measurements of the ____ of a seismic wave.
speed

frequency

intensity

amplitude

10. Molten rock beneath Earth’s surface is called ____.
magma

tephra

lava

pyroclasts

ROSCOE