1. the five boxes below represent a geologic cross-cut with five layers (a is on top and e is on the bottom). the types of rocks are listed on the right side. in each box, write the appropriate type of rock and explain the answer in relation to the history of the earth’s atmosphere.

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.