Why are fountains often found in enclosed courtyards of houses in hot and dry countries?

Which of these reactions are redox reactions? check all that apply.cd + hcl → cdcl2  + h2cucl2  + na2s → 2nacl + cuscaco3  → cao + co2          2zns + 3o2  → 2zno + 2so2          ch4  + 2o2  → co2  + 2h2o

Arecipe calls for 1.2 cups of oil. how many liters of oil is this?

Nonpoint source pollution is difficult to control because it