The rock labeled “a” is a. igneous. c. sedimentary. b. metamorphic. d. magma. select the best answer from the choices provided (answer : c) hope this !

C. sedimentary

Explanation:

The rock labeled "A"  is a sedimentary rock. About 75 % of the Earth's surface is covered by sedimentary rocks. As a result of weathering sediments are formed. These sediments are transported and deposited by wind and water. The loose sediments then compressed and hardened to form sedimentary rocks. Examples of sedimentary rocks are sandstones.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).