What are some of the useful products humans obtain from volcanoes? What will be an ideal response?
Dental pumice is refined and flavored volcanic pumice with a hardness just slightly less than tooth
enamel. Lava brand hand soap and some abrasive cleaners contain pumice. Volcanic rock is also used
to make lightweight bricks, cinder blocks, and many road-foundation and decorative stone products.
Volcanic cinders can be mixed with oil to form asphalt pavement. Pieces of rock pumice are sold in
drugstores, supermarkets, and hardware stores for use as a mild abrasive for removing skin calluses
and unsightly mineral deposits from sinks and toilets. Native Americans and Stone Age peoples in
many parts of the world used obsidian to make tools and arrowheads. Today, obsidian is used in
scalpels where a much finer blade than conventional steel is required.
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What happens when rocks oxidize near Earth's surface?
A) minerals in the rock release oxygen that can break down adjacent rocks B) oxygen combines with water to create weak acids that weather rocks C) minerals, especially those with iron, combine with oxygen D) oxygen combines with silica to make quartz
Radiational cooling typically occurs:a
during the afternoon. b. at night. c. during the late morning.
What are the possible indirect effects of past Glaciers?
a. Migration of animals and plants b. Changes in stream courses c. Worldwide change in sea level d. Climate changes e. All of the above
A green flash is associated with sunrise or sunset
Indicate whether the statement is true or false