What places in the world can be part of the seven wonders of the world?

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

Which of the following is defined as combinations of soil particles that vary in size and shape?

How does central place theory explain patterns in the size and distribution of cities?