The silicon atom of the silica tetrahedron has a (+/-) ____________________ charge of

____________________ (number?) and the oxygen atoms have a (+/-) ____________________
charge of ____________________ (number?). Therefore, the ion group has an overall (+/-)
____________________ charge of ____________________ (number?). Fill in the blank(s) with the appropriate word(s).


positive, four, negative, two, negative, four

Environmental & Atmospheric Sciences

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What is an effect of a volcano with Rhyolitc magma?

A) Rhyolitic magma has low gas content; volcanoes with this type of magma erupt gently. B) Rhylotic magma has low viscosity; volcanoes with this type of magma erupt more often. C) Rhyolitic magma has high gas content; volcanoes with this type of magma erupt violently. D) Rhyolitic magma has low gas content; volcanoes with this type of magma erupt less often.

Environmental & Atmospheric Sciences

Anthropology is the study of human beings. Therefore, the name of the system that refers to humans

on Earth is the ____________________. Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

The relationship between weathering and erosion can best be characterized as

A. weathering loosens material after erosion has carried it away, but erosion can also scour and move unweathered material. B. weathering loosens material before erosion carries away, but erosion can also scour and move unweathered material. C. weathering must happen before erosion can occur. D. weathering must happen once erosion has moved material.

Environmental & Atmospheric Sciences

What are sites of concentrated weathering?

a. levees b. joints c. salt crystals d. spheroidal blocks

Environmental & Atmospheric Sciences