This Greek mathematician was known for his work in geometry and physics. The Greek army used two of his inventions: the catapult and the mirror system. Egyptians later used a screw system that bears my name to Irrigate the Nile River Valley. Who am I?

Archimedes

Explanation:

In the Nile, there is a place called Archimedes' Screw.

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explanation:

hitler's  "rise" can be considered to have ended in march 1933, after the reichstag adopted the enabling act of 1933 in that month. president paul von hindenburg had already appointedhitler  as chancellor on 30 january 1933 after a series of parliamentary elections and associated backroom intrigues.

b toward the volcano.landward. the landward side of something is the side nearest to the land or facing the land, rather than the sea.