Define permafrost.
a. water below the surface of the tundra stays frozen all year long
b. the frozen soil in mountain highlands
c. rainwater that collects on rocks after a cold rainstorm
d. the dew droplets that freeze at high altitudes

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail

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30% of the earths surface is made up of? a. water b. desert c. land d. cities