A delta is formed by constructive erosion.
Scientists can find out when the volcano erupted by determining the age of the fossils in the ashy layers of sediment in area.
<h3>What is a Volcano?</h3>
This is defined as a vent or opening where lava erupts on to the surface of the Earth.
The age of the fossils in the ashy layers of sediment in area will help to determine the time when the volcano erupted.
Read more about Volcano here brainly.com/question/440765
I think B is the answer. Hope this helps!
It helps organize the biology of different bi-organisms plz mark as brainlest<span />
