Which property of soil can David provide evidence of?
a
The bottom layer is the lightest because it is the youngest.
b
The top layer is dark because it contains a lot of organic matter.
c
The rocks in the layers are identical because they formed at the same time.
d
The layers are the same size because they took the same amount of time to form.
b
To provide evidence of a specific property of soil, David can provide evidence for option b: "The top layer is dark because it contains a lot of organic matter."
One way David can gather evidence for this property is by conducting a soil analysis. He can collect soil samples from different layers and analyze their composition. By measuring the amount of organic matter in each layer, such as through tests like carbon content analysis or organic matter decomposition tests, David can determine if the top layer contains a significantly higher amount of organic matter compared to the lower layers. If the top layer has a darker color, it could indicate the presence of decomposed organic materials, such as dead plants and leaves, which contribute to the formation of organic matter.