The earth's crust is principally composed of a. granitic and sedimentary minerals b. granitic and basaltic minerals c. basaltic and sedimentary minerals d. none of the above select the best answer from the choices provided a b c d\

Option B, granitic and basaltic minerals

Explanation:

One of the most common rock form is granite that is found in abundance in earth crust. The common minerals in granite that are found in earth’s crust are – quartz, mica, hornblende and fledspar. Basalt is a volcanic rock that forms after the cooling of lava. After weathering, the basalt is broken down into small fine pieces known as soil. Soil is the top most layer of earth crust and hence The Earth's crust is principally composed of both granite and basalt minerals.

Option B is correct.

b is the correct answer

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: