You walk outside and find your dad installing a wall of large rocks halfway down your sloping backyard. Before your dad began
building the wall, parts of your backyard looked like the picture above. Which choice is the best explanation for why your dad wants
to install this wall of rocks?
A)
He is a rock collector and thinks they will look nice in the back yard.
B)
He wants to divide the yard into two equally sized areas for gardening,
The rocks make it easier to walk up and down the sloping back yard.
D)
The rocks will keep the soil from washing down the sloping back yard.
Earth's Systems