Recent—the present [epoch] of geologic time; the second epoch of the [Quaternary] [Period] (see [p. 3]).
Sectile—describes material, such as soap, that can be cut smoothly with a knife.
Sediments—material deposited by water, wind, or ice on the earth’s surface.
Sedimentary rocks—rocks made up of [sediments].
Series—a subdivision of a [system] that includes all rocks formed during an [epoch].
Specific gravity—the ratio of the weight of a substance to the weight of an equal volume of water.
Streak—the color of the powder of a mineral.
System—all rocks formed during a [period].
Tertiary—the first [period] of the [Cenozoic] [Era] (see [p. 3]).
Translucent—light will pass through, but objects cannot be seen.