Dark, natural glass formed by cooling of molten lava.
What is Obsidian.
A large area of high land.
What is plateau.
The regions close to the equator.
What is tropics.
Of or belonging to a nomad, a member of a people that moves from place to place with no fixed home.
What is nomadic.
Calm, peaceful. The largest ocean. So large that all the landmasses in the world could fit into it.
What is Pacific.
A fertile green area in an arid, or dry, region.
What is oasis.
Dry, level grasslands with few to no trees.
What is Steepe.
The supplying of land with water, especially for growing crops.
What is irrigation.
A large area of flat or rolling land, with no mountains and few trees.
What is Prairie.
A warm water ocean current that flows in the North Atlantic from the Gulf of Mexico, northward along the coast of the United States, and then to the British Isles.
What is Gulf Stream.
Grassland containing scattered trees.
Savannah
Not too hot, not too cold. The temperate zones - the latitudes between the frozen polar zones.
What is temperate.