What are two things that are impervious to water? impervious

Impervious materials can be defined as the artificial materials such as pavements which are basically covered by the substances that does not penetrate. Theses materials can be brick, stone, concrete. The water behaves very differently on the impervious materials, it keeps on flowing on the material until it gets a place to be absorbed like soil or it can enter into a wetland or some other place.

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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.