The silt from the nile river has been used as a crop fertilizer for thousands of years. after the construction of the aswan high
dam, which of the following occurred?
a. more silt was carried down river, jamming electrical turbines and preventing the dam from generating
electricity.
b. more silt was carried down river, and agricultural production increased as a result.
c. less silt was carried down river, so farmers began to use more chemical fertilizers.
d. less silt was carried down river, protecting the nile river delta from further damage.

C. Less silt was carried down river, so farmers began to use more chemical fertilizers.

Explanation:

The Aswan Dam blocks the water from the Nile. The build of water flooded the area behind the dam forming Lake Nasser. Silt is built up behind the dam and deposited on the floor of the lake. In controlling the water the flows through less flooding and droughts occur. However, alluvium does not deposit of the farmland to help its fertility. Therefore, more farmers rely on fertilizers.

answer is  

loa ≅ lma

to prove that the triangles are congruent using the aas congruence