According to the law of superposition, which layer is the oldest? youngest?

According to the law of superposition which is the basic law of geo-chronology, in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.

So, the oldest layer is at the bottom and the youngest layer is at the top.

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

just sum

10 + 10 = 20