Question

1. what is a scientific law?

an explanation for how or why natural events occur
an explanation for observable phenomena
a proposed explanation for an observation
a description of the relationship between two variables

Explanation:

A scientific law describes a consistent relationship between variables in nature. It is not an explanation (that's a scientific theory), nor a proposed explanation (hypothesis). It simply describes what happens under certain conditions.

Answer:

a description of the relationship between two variables