which geographic features protected the roman empire from barbarian invasions until the 4th century A. D

Where is Songhai Ghana and Mali in africa

Mosses, lichens, and shrubs can be found where in russia?

Why are only 1/3 of senators up for reelection every two years?

Magma that reaches earth's surface and flows from volcanoes true or false

Most plants and animals are pretty flexible and can thrive in more than one biome. TrueFalse

5x-4+21+90=180, what is it?

Which statement is NOT true of North Korea A. It is generally believed in North Korea possess nuclear weapons B. North Korea limits trade with each other continental neighbors, China and Russia C. Low-lying mountains cover its northern region D.

Why are oxygen concentrations in the deep waters of the North Atlantic higher than the concentrations found in the deep North Pacific?

By what year will 2/3 of the world's population lack access to clean drinking water?

How Dawlish Warren is formed