Earth Science - January 2010

 31 Which diagram best represents the size of the Moon, compared to Earth, when drawn to scale?

Click on image to enlarge

32 The model shown below illustrates stream erosion between locations A and B in the stream.

 

Placing a second block under location A will cause the stream’s velocity to

(1) decrease and the rate of erosion to decrease
(2) decrease and the rate of erosion to increase
(3) increase and the rate of erosion to decrease
(4) increase and the rate of erosion to increase

Base your answers to questions 33 and 34 on the diagram of Earth shown below. Letters B, C, and D represent layers of Earth. Letter Q represents a location on Earth’s surface.

33 What is the probable density of the granitic bedrock at Q?

(1) 1.0 g/cm3     (3) 3.0 g/cm3
(2) 2.7 g/cm3     (4) 5.5 g/cm3

34 Which letter best represents Earth’s mantle?
  
(1) Q     (3) C
(2) B     (4) D

35 The block diagram below represents the present ocean floor. The white arrows show the movement of the ocean floor and the black arrows show the movement of the asthenosphere.

Click on image to enlarge

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