Which of the following changes to the sun's total energy output will likely occur as the number of sunspots increases?
A. slight decrease
B. no change
C. alternately increase and decrease above average values
D. slight increase
Answer: D
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Which feature on this diagram is an arête?
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
Historic sectors of Northern Africn cities, valued for their social fabric, are called _____________.
Fill in the blank(s) with the appropriate word(s).
Continents have the best puzzle-like fit when placed together along their continental slopes
a. True b. False
What language began as a trade language in Sub-Saharan Africa and is now the most widely spoken language in the region?
A) French B) Arabic C) Swahili D) Spanish E) Portuguese