Explain a ‘negative’ effect from the land bridge

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

How would i answer this in a exam. orange - sea temperature is over 27 red arrows - tropical storm routes

Which of the following areas has the highest population density?