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Where do clouds form? Select three options.

at the ground
in the upper atmosphere
near the Earth’s surface
where the air has very low humidity
where the atmosphere contains few particles

at the ground, in the upper atmosphere, and near the earth's surface.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.