The correct answer is - lava dome.
The lava dome represents a circular mound-shaped protrusion which is a result of a highly viscous and slow magma coming up in a larger volcano. Because it is very highly viscous, this type of magma cannot move far away from the volcano and usually builds up. The high viscosity can be as a result of either degassing of the fluid magma, or from a very high content of silica in its structure. Around 6% of the eruptions in the world create lava domes, usually in convergent plate boundaries.
sub-saharan africa's rural population
A is the answer ps i am also vietnamese
The answer is - Ocean.
All of the oceans in the world are connected, so they practically represent one huge body of water, which is by far the biggest in the planet, and is also a body of water that consist salt, thus it has salty water.
The oceans have sub-divisions, smaller than them, called seas. They range a lot in size, while some are huge, others are smaller than some big lakes. They represent a remote, peripheral part of the oceans, naturally surrounded by some geographical land forms, still they are part of the oceans.
