What was the purpose of "indigo," something sought after by early colonists? it could be smoked it was an addictive plant it was a type of gemstone it was a pigment for clothes

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Which statement explains what upwelling causes? a. upwelling causes tides to rise and fall. b. upwelling causes changes in the direction of currents. c. upwelling causes nutrients, minerals, and tiny organisms to rise. d. upwelling causes currents in the pacific ocean to change direction. i think the answer is c.

Which season occurs in the northern hemisphere when the sun is at its lowest point in the sky