Mountain building causes metamorphism because ________.
A) mountains are heavy and they compress the rocks under them.
B) mountains are heavy and they push shallow, cool rocks to depths where they get
heated
C) mountains form by the gradual buildup of material that comes from other areas and
this can produce an uneven pressure on rocks
D) all of the above
You live in a seismically active area and there are steep mountain slopes that show
evidence of past large landslides. A geologist uses radiocarbon dating and determines
that all of the landslides are 1000 +/- 5 years old. He also determines that there is an
active fault in the area that moved in the last 1000-2000 years but he can’t date it
precisely. Which of the following is a reasonable conclusion?
A) Radiocarbon dating is not a good dating technique or it could separate the ages of
the slides.
B) There was probably an earthquake ~1000 years ago.
C) There must have been a major drought 1000 years ago that triggered the landslides.
D) There must have been people in the area 1000 years ago, and they cut down the trees
that were dated for determining the age of the landslide.