Explain the process of convection as it occurs on Earth , and include a diagram of a convection cell. Make sure your
drawing shows Earth’s core, mantle, crust, a spreading ridge, and a trench. What will be an ideal response?
Rocks at the base of the mantle receive heat from the core (supplemented by radioactive
decay) and rise. As they rise, the cool, become dense, and sink. As they sink, they warm and
the cycle continues.
The drawing should be a simplified version of Figure 3.22. Main points to look for are:1.
Convection cell is drawn in the mantle
2. Convection cell shows rock rising under spreading ridges.
3. Convection cell shows mantle rock sinking at trenches (subduction zones).
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What evidence of wave erosion is visible along the shore of Drakes Bay between Drakes Beach and Point Reyes?
The question is based on Map T-15, the “Point Reyes, California” quadrangle (scale 1:62,500; contour interval 80 feet) showing Point Reyes and Drakes Bay in Point Reyes National Seashore (38°01'38"N, 122°57'51"W). What will be an ideal response?
Voltage can be induced in a wire by
A) moving the wire near a magnet. B) moving a magnet near the wire. C) changing the current in a nearby wire. D) all of the above E) none of the above
Exfoliation and pressure-release jointing are examples of ________ weathering processes
A) chemical B) physical C) biological D) both biological and physical
Assume that you have just examined several flat-lying sedimentary layers. After much study you determine that there is a considerable span of time for which no sedimentary rock layer exists at this site. You have just discovered a(n) ________
A) angular unconformity B) series of conformable strata C) example of cross-cutting relationships D) disconformity