Question

1. read the following sentences from the passage: “because water refracts light, we’re able to see clouds even though the droplets are small and it’s mostly empty air. this also explains why clouds take on the color of the light that illuminates them. clouds appear white when the light is purest at mid - day.” as used in the passage, what does the word “illuminate” mean? a to darken b to burn c to heat up d to light up

Explanation:

The context is about how clouds take on the color of the light that affects them. "Illuminate" in this context means to provide light to something. "To light up" has a similar meaning. The other options "to darken", "to burn" and "to heat up" do not relate to the concept of light in this context.

Answer:

D. to light up