Question

2
david is investigating the properties of soil using the sample shown.
which property of soil can david provide evidence of?
○ the rocks in the layers are identical because they formed at the same time.
○ the bottom layer is the lightest because it is the youngest.
○ the top layer is dark because it contains a lot of organic matter.
○ the layers are the same size because they took the same amount of time to form.

Explanation:

Soil horizons (layers) have distinct properties. The top layer (topsoil) is dark due to high organic matter from decaying plants/animals, which matches the diagram's dark top layer with vegetation. Other options are incorrect: layers form at different times, bottom layers are older (not youngest), and layers vary in size/composition.

Answer:

The top layer is dark because it contains a lot of organic matter.