Once heat from the sun penetrates the earth's atmosphere, the heat is circulated as warm air rises and cold air sinks. what is this process called?

a. radiation b. conduction c. reflection d. convection

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For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate