[skeeter]

Satellites can detect volcanoes that are more than 1500 m high because the mass of the submerged mountains causes gravity to pull the water in around them. This creates domes on the ocean's surface that can be several metres high and can be detected from space.

Pretty interesting - I wish they'd elaborated on this phenomenon though. Wouldn't the gravity caused by the mountain mass itself pull the water down causing a dish, rather than dome, on the oceans surface?

[null and void]

It would if it didn’t also pull more ware in from the sides...

[BuffaloJack]

“Pretty interesting - I wish they’d elaborated on this phenomenon though. Wouldn’t the gravity caused by the mountain mass itself pull the water down causing a dish, rather than dome, on the oceans surface?”

Nope! Gravity isn’t just perpendiculat to the ocean surface. It would also pull every way perpendicular to the mountan mass and thus the net effect would be a bump.