A deposit of wind-blown silt is called ____________________
Fill in the blank(s) with correct word
loess
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Has the ocean around the continent changed temperature during the time between the first and second image? Why?
The question is based on Figure 20-4, infrared images of Africa taken 9 hours apart. What will be an ideal response?
Why do waves expend so much energy on a rocky headland?
A) Waves reflect off the headland and amplify the incoming waves. B) Wave velocity is greater on headlands than on beaches. C) Waves refract toward the headland on both sides. D) Headlands tend to have deeper water surrounding them, so the waves are higher.
The Gulf of Mexico's dead zone is caused by high levels of ____ in the Mississippi River.
A. coliform bacteria B. phytoplankton C. plant nutrients D. algae E. cyanobacteria
Plate tectonics is a unifying idea that helps explain where and why there are ________ on Earth.
A. earthquakes B. mountain belts C. oceanic ridges and trenches D. volcanoes E. All of the answers are correct.