Which is better: United States, or PRC (China)

If a population is growing quickly in a small area then what must increase as well

The coco river is a natural border between nicaragua and which other country

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?