What facilitated trading for the mayans?

A. a knowledge of mining

B. the lowland river system

C. the volcanic highlands

D. the proximity to 2 oceans

Most of the stars in the Milky Way will end their lives as a. white dwarfs. c. supernovas. b. black holes. d. red giants.

How much longer is the nilethan each of the three major rivers of south Asia

During the late 19th and early 20th centuries, direct observations showed that a glacier in Switzerland flowed forward in the downhill direction while its snout (terminus) was retreating higher up the valley.

Tropical rain forests tend to have a lot of humus, but the soil in those biomes retain little of it because of leaching. What is leaching?

From the study of Mendel's experience, infer how two tall parents could have shorts offspring

Minerals from several closely related species make up a

What observations can be made about a rock at the outcrop scale?

WHY is Earth structured the way it is?

What landform is not formed by an internal force

Which of the following would represent a plane in the real world