Question
Complete the passage based on the formation of coal.
About 300 million years ago, the Earth had dense (1) ____________ in low lying wetland areas. Due to natural processes, these forests got buried under the (2)_________. Under high (3)____________ and high (4)________, dead plants got slowly converted into coal. The slow process of conversion of dead vegetation into coal is known as (5)_____________.
temperature, coalification, pressure, soil, forest