How do stalactites, stalagmites, columns, drip curtains, and travertine terraces form? What will be an ideal response?


Stalactites are icicle-like structures that hang from the ceiling due to precipitation from dripping water.
Each drop leaves a thin layer of calcite over the previous layer, so the structure grows down from the
ceiling. Stalagmites grow upward from the floor from small drops that come off the stalactite. A
column forms when a stalagmite and stalactite meet. A drip curtain is created by water seeping from a
crack in the caves ceiling to form a vertical sheet of rock. Water flowing along the cave's floor can
produce travertine terraces.

Environmental & Atmospheric Sciences

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A. Physical weathering B. Chemical weathering C. Biological weathering

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Island arcs are associated with

A. ocean-ocean convergences. B. ocean-continent convergences. C. hot spots. D. continent-continent collisions.

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Which pair of variables below are not related in a positive feedback loop?

A. snow cover on Earth's surface; global average temperature B. population of rabbits and bobcats C. water vapor and air temperature D. population of hummingbirds and population of flowers

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A hydroturbogenerator would be found

A) at a hydroelectric dam. B) at a coal-fired power plant. C) inside of a wind mill used to generate electricity. D) in a power plant that uses oil for fuel.

Environmental & Atmospheric Sciences