Amarine weather station reports waves along the shore that are eight seconds apart. the frequency of the waves is therefore __ hertz. 1/8 1/4 4 8

"8 seconds apart" means that one wave-peak arrives every 8 seconds.
That's another way of saying that the PERIOD of the waves is 8 seconds.

Frequency = 1/period = 1/8sec = 1/8 per second = 1/8 of a Hz.

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.