Fill in the blanks and complete the story. About 300 million years ago the earth had dense in low lying wetland areas. Due to natural processes, like , these forests got burried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. Under high and high , dead plants got slowly converted into coal.

About 300 million years ago the earth had dense forestsin low lying wetland areas. Due to natural processes, like floods, these forests got burried under the soil. As more soil deposited over them, they were compressed. The temperaturealso rose as they sank deeper and deeper. Under high temperature and high temperature, dead plants got slowly converted into coal