Which feature on this diagram is a tarn?
A) 1, the circular depression at the head of the valley
B) 2, a lake in the upper valley
C) 3, a steep ridge
D) 4, a valley that is above the level of the main valley
B) 2, a lake in the upper valley
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Cross beds in sandstone rocks can be indicative of an ancient desert climate.
Answer the following statement true (T) or false (F)
Explain why it is much more difficult to measure snowfall amounts than rainfall amounts, and describe the instruments commonly used to measure snowfall amounts
What will be an ideal response?
The energy that allows tectonic plates to interact on the earth's surface is supplied by:
A. the sun. B. the molten interior. C. greenhouse gases. D. ocean currents.
This figure shows three blocks in water. Which of these materials is the densest? 
A. block 1 B. block 2 C. block 3 D. the water 4