Asource created after event by person who didn't witness it.

a: primary source

b: secondary source

c: tertiary source

Which statements explain reasons why unconformities occur? check all that apply. rocks along a fault break and move. igneous rock forms at earth’s surface. rocks erode and sediment is deposited. no sediment is deposited over a long time. igneous rock forms between sedimentary layers.

The oldest known mesopotamian civilization settled in areas along river banks or sea sides surrounded by mountains and deserts which two statements explain why three geographical features led to the rise of mesopotamian civilizations

In what is known as the great migration, large numbers of african americans moved from the rural south to northern cities, beginning in the early twentieth century. what motivated this large-scale movement?