Crust, Mantle, & Convection Jagmark

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Crust, Mantle, & Convection Jagmark

A. all the way to the bottom of the crust Sit in your groups 1. According to Viewpoint 1, an ascending plume of hot mantle material that originates near a depth of 2,900 km would be able to rise: A. all the way to the bottom of the crust B. all the way to the surface of Earth C. only to the bottom of the upper mantle D. only a few km above that depth

2. Which of the following statements best describes how the 2 viewpoints are alike? A. Both are based on the nature of rock samples from the deep sea floor B. Both agree that material from the lower mantle mixes with the upper mantle C. Both agree that the mantle has the same properties throughout its depth D. Both depend to some extent on studies using seismic waves.

3. Which of the following hypotheses provides the best compromise between the 2 viewpoints on the current structure of the mantle? A. Convection took place only in the upper mantle when Earth was new, but billions of years later, the entire mantle was involved. B. Convection took place throughout the entire mantle when Earth was new, but today, convection is limited to the upper mantle C. Mantle convection has ceases and the mantle is now a layer of uniform temperature and density D. Only the hottest part of the material ascending from the lower mantle rises past the 600 km boundary, so only part of the lower mantle mixes with the upper mantle.

A. Viewpoint 1; 600 miles deep upper mantle 4. Which viewpoint states that convection occurs in only part of the mantle and which part do they hypothesize that it occurs in? A. Viewpoint 1; 600 miles deep upper mantle B. Viewpoint 2; 600 km deep upper mantle C. Viewpoint 2; bottom 600 km of lower mantle D. Viewpoint 1; 600 km deep upper mantle

5.Using the passage, find the following terms and determine their meaning: convection, distinct, exchanged, transforms, descend A. Convection- heat, fall, cool, rise; Distinct- different; Exchanged- give up; Transforms- changes; descend- rise B. Convection- heat, rise, cool, sink; Distinct- different; Exchanged- passed between the boundaries; Transforms- breaks; descend- sink or fall C. Convection- heat, rise, cool, sink; Distinct- different; Exchanged- passed between the boundaries; Transforms- changes; descend- sink or fall D. Convection- heat, rise, cool, sink; Distinct- same kind of; Exchanged- passed between the boundaries; Transforms- breaks; descend- skip