When Volcanoes are born in the sea, the eruptions may be more violent than those on land because of the contact between molten rock and seawater produces steam. 關係子句的主詞是 "the contact" 所以produce 後面要加 "s"
...改變詞性的。 2013-09-01 21:01:00 補充： Magma is stored in crustal reservoirs before eruption. Hot lava erupted from the crust.
...s crust and occasionally bursts through cracks and fractures in violent volcanic eruptions, lurks an energy source that scientists think could be tamed...