Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?

Write two important uses of coke.

Write the characteristics and some important uses of coal.

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.

Match the items given in Column I with the items of Column II.