20. Glaciers are moving sheets of ice. They form when the amount of snowfall in the
area exceeds the rate of snowmelt. Within
the past 20,000 years, glaciers covered a
large portion of the Northern Hemisphere.
Based on the information above, which of
the following is most likely true?
(1) In areas where glaciers formed, the
rate of water freezing was greater
than ice melting
(2) The glaciers move very rapidly.
(3) The climate has remained unchanged
for 20,000 years.
(4) Glaciers form only when the
temperature is above the freezing
temperature.
(5) Glaciers are found only in
mountainous areas.