Why was the basin system of irrigation largely abandoned by farmers near the nile river in modern times

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Why would the crystals in an intrusive igneous rock be larger than the crystals in a chemical sedimentary rock? a. intrusive rocks form beneath the earth's surface, so they cool very slowly, which produces larger crystals. b. chemical sedimentary rocks form from dissolved substances on the earth's surface with very high heat and cool very slowly, which produces smaller crystals. c. chemical sedimentary rocks and intrusive rocks have crystals of the same size. o d. chemical sedimentary rocks form deep in the earth, so they cool slower, which produces small crystals. € read question correct:

Wegeners theory of continental drift states that the continents have changed throughout history while the theory of plate tectonics