The upper mantle can be divided into two zones, the
A) asthenosphere in the lower upper mantle and part of the lithosphere in the upper part of the upper mantle.
B) asthenosphere in the upper, upper mantle and the lithosphere in the lower upper mantle.
C) Moho and the lithosphere.
D) continental mantle and the oceanic mantle.
A
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What will be an ideal response?
The gaseous oxygen in the Earth's atmosphere was produced as a by-product of
A) volcanic outgassing. B) photochemical reactions breaking down ozone (O3 ) to form oxygen (O2 ). C) photosynthesis. D) decay of organic matter.
Which of the following states has the lowest earthquake risk?
A. Nevada B. South Carolina C. Massachusetts D. Florida E. Arkansas
Micro-organisms called foraminifera have tiny coiled shells with chambers, not unlike the chambering nautilus but much smaller. In modern oceans the coiling direction of foraminifera shells is correlated to temperature
Using coiling direction from foraminifera fossils is an example of ________. A) using isotopes to fingerprint temperature B) using the fossil's coiling direction is a proxy for climate because the surface water temperature would be highly correlated to surface temperature C) geomagic; the whole idea is preposterous D) using the fossil as a paleo-depth indicator because water temperature varies with depth