Explain how a pond could become a swamp.

if lots of plant life began to grow in it, the soil started to erode to make it muddy and unstable, and it was perpetually damp, moist and humid, certain creatures would start to live there and it would be very close to becoming a swamp

Explanation:

It is based on the law of superposition to infer the age of rock layers and there by determining the age of fossils present in it.

Explanation:

From the passage, the law of superposition states that lower is the layer of rock, older is its age. We can determine the relative age of rock layers with the help of this law, if the the rock layers are not disturbed during the course of time.

Since fossils can be observed in these rock layers we can use the technique of relative dating to determine the relative age of fossils. In this method, we can reasonably say that the fossils found closer to the surface of earth are the more recent ones than the fossils found in the deeper layers of rock.

Fossils found in the same layer of rock can be supposed to be of same age. This relative dating method is useful to compare the ages of fossils but we cannot precisely find it.