Match the definition in column 1 with the term in column 2.

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine