In general how does the density of a light colored igneous rock differ from that of a dark ingneous rock

The density of lighter-colored igneous rock is usually less than that of darker-colored igneous rock

Explanation:

Igneous rocks are formed from crystallization of magma or lava. Igneous rocks formed from magma are intrusive rocks and form below the earth's surface while those formed from lava are extrusive and form above the earth's surface.

Igneous rocks can also be classified based on their chemical composition. Igneous rocks with a higher composition of felsic minerals (feldspar, quartz) are lighter in color in comparison to those rocks with a higher composition of mafic minerals (magnesium, iron). Felsic minerals tend to be of a lighter colour and have a specific gravity less than 3.0 while mafic minerals are darker in color and have a specific gravity greater than 3.0

While the color and density of igneous rocks do correlate with each other due to the properties of the minerals, the color and density are not directly related to each other.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.