Image for 16 cardinal point​

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

Explain how a convection current in the earth is formed.

Based on the information in the graph, what can you conclude about humans in the world in general?