What is volcanism, and what types of rocks does it produce? What will be an ideal response?
Volcanism is the process by which magma rises through Earth's crust and issues forth at the surface as
lava flows and/or pyroclastic materials and gases. Volcanism is responsible for all extrusive rocks,
such as basalt, tuff, and obsidian.
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In order to account for uncertainty, regulators typically set allowed levels of exposure to toxic substances at 100 or even 1000 times the estimated harmful levels.
Answer the following statement true (T) or false (F)
A solution with a pH of 3 is ________ a solution with a pH of 5
A) 4 times less acidic B) 4 times more acidic C) twice as acidic D) half as acidic E) 100 times more acidic
GPS units
A) accurately allow determination of location anywhere on or near Earth's surface. B) are a metric version of longitude and latitude. C) are not available to the public; they are only available to the military and other government agencies. D) have little practical use in physical geography. E) are th of a Greenwich Precision Second.
Stream erosion produces what type of valley shape?
a. V b. U c. S d. W