NEET BIOLOGY

Detailed explanation-1: -Southwest Asia’s biggest pollution problems come from human sewage, agricultural runoff, and industrial waste. Rapid growth of industry in cities and towns has caused garbage and sewage to build up in rivers and streams. Towns without proper sewer systems dump untreated human waste directly into rivers.

Detailed explanation-2: -As countries in Southwest Asia have worked to modernize their systems of agriculture, water pollution has been a growing problem. Increased demand for irrigation to expand farming has led to overuse of rivers and streams.

Detailed explanation-3: -Many countries in Southwest Asia are experiencing the increasing problem of water pollution. Farmers have begun using chemical fertilizers that run off from the fields and contaminate water supplies. Chemicals also lead to salt build-up in the soil, which eventually makes farming in those areas impossible.

Detailed explanation-4: -Most of Southwest Asia has an arid, or very dry, climate. Deserts cover most of the Arabian Peninsula and large parts of Iran. Temperatures can rise to 129°F (54°C). When rains come, torrents of water race through wadis, or streambeds that are normally dry.