What does a star or dot in a circle usullyy mean in a map

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.