What is an ice quake?
a. The force of that creates a wave
b. Ice that is smashed and ground together to form pressure ridges
c. The force that determines a wave's size
d. An ice shear zone where waves collide
ANS: B
The segment about Dr. Steger’s arctic foothold being jeopardized by huge waves moving beneath the
ice is describing the movement which is like an earthquake at sea. Ice the size of city blocks are
falling and being smashed and ground together creating an ice quake. Information can be found in the
section Insight to a National Geographic Explorer
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Which of the following can occur within a magma chamber?
a. sinking or floating crystals may change the composition of the remaining magma b. wall rocks can melt and become incorporated into the magma c. if two magmas mix, the resulting magma would be between the composition of the two d. all of these
The addition of water to the zone of saturation is known as ____________________
Fill in the blank(s) with correct word
Shrubland has a wide distribution but is most common in ________ locales
A) tundra B) semiarid C) marshes D) steppes E) riparian
According to the three-cell general circulation model, _____________ pressure at the surface is located at 30 degrees latitude and ____________ vertical motion is expected in this location.
a. high; rising b. low; rising c. high; sinking d. low; sinking