Question

the lights from cities can be seen from space and seem to form a web of lines. geography has played an important role in where cities are located. the older metamorphic rocks are harder than the sediments of the coastal plain. the fall line provided many natural resources that attracted settlers. several types of mills were built along rivers because the water provided power.

Explanation:

The question (assuming it's about identifying which statement relates to geology/rock types) has the statement "The older metamorphic rocks are harder than the sediments of the coastal plain." This involves rock types (metamorphic rocks, sediments) which is part of Geography (specifically physical geography/geology sub - field of Geography). The other statements are about city lights, city location due to geography (more human geography), fall line and settlers, and mills by rivers. The one about rock hardness is related to the physical characteristics of the earth's crust which is a key part of Geography's study of the earth's physical features.

Answer:

The statement "The older metamorphic rocks are harder than the sediments of the coastal plain." (the third statement in the list)