During periods of high solar activity, huge cloudlike structures that appear as great arches extending from the Sun are often produced. These solar features are called ________
A) the solar wind
B) plages
C) quasars
D) spicules
E) prominences
E
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How many electrons are gained or lost in the following half-reaction? C ? C-4
A. 2 electrons are lost B. 1/2 electron is gained C. 1/2 electron is lost D. 2 electrons are gained E. 4 electrons are gained
Recent studies indicate that between the 1950s and 1990s solar radiation reaching the Earth's surface may have:
A) increased 10%. B) decreased 10%. C) stayed the same. D) increased 25%.
The vertical pressure gradient force is directed downward. Indicate whether the statement is true or false
Which of the following is true about Indigenous people in the Russian Arctic?
A) Dolgan people herd reindeer B) seasonal ice is integral to life C) the tundra environment influences culture D) all of the above E) none of the above