The greatest cluster of people in Russia lives in
A. Siberia
B. The steppes
C. The far north
D. Western Russia
D. Western Russia
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The organisms that make their own food are called ____
A) primary consumers B) primary producers C) heterotrophs D) secondary consumers
A 10-kg block is moved across a horizontal surface with a 30-N horizontal force against a friction force of 10 N. The block's acceleration is
A. 1 m/s2. B. 10 m/s2. C. 5 m/s2. D. 2 m/s2.
Why are there multiple atmospheric cells as air moves from the equator to the poles instead of one
single cell? a. There are variations in the solar radiation. b. There are intermediate precipitation events which break up the air into circulation cells. c. There are variations in the speed of wind. d. The Coriolis effect breaks the air mass into atmospheric cells.
A uranium-lead age determined from a zircon crystal removed from a sandstone would reflect the time elapsed since the ________ of the zircon
A) erosion B) deposition C) crystallization D) cementation