Visible on the photosphere of the sun, _______________ appear as dark regions that are about 1500°C to 2000°C (2700°F to 3600°F) cooler than the temperatures of the surrounding areas
Fill in the blank(s) with correct word
sunspots
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How do many exotic species find their way to new waters?
A) Migrations B) Carried in the ballast water of tankers C) Marine birds D) None of these choices
The Cretaceous-Tertiary impact event was first discovered through the chemistry of sediments
Indicate whether the statement is true or false
What force causes mass wasting?
A. steep slopes B. gravity C. excessive water
A citizen-based global sustainability movement that is emerging is comprised of
a. a loosely connected worldwide network of grassroots NGOs b. regulatory agencies within governments that oversee environmental laws c. special interest groups that lobby for restriction of environmental laws d. environmentalists that have won elections e. a well-funded movement to change the way public lands are used in the U.S.