Fossils

November 1, 2016

Gr 3-6-Each of the major types of rock-sedimentary, igneous, and metamorphic-receives its own treatment as do fossils, crystals, the rock cycle, and minerals in this selection. (Soil is the sole volume that is not directly about rocks.) Main ideas, such as the three rock types and the rock cycle, are repeated to some degree in nearly every volume, resulting in a series that walks a fine line between reinforcing concepts and being redundant. The layers of the earth and Martian rocks also appear more than once. The potential uses of various rocks are discussed, as are occasional issues, such as the impact of mines and mining on the environment.

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