What is an aquifer? a. a river dam b. a natural underground water supply c. an environmental hazard caused by drilling d. a state agency that monitors water usage (the answer is B, i just wanted to put the question)

a natural underground water supply

Explanation:

An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt). Groundwater can be extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology.

in 1859, brown and 21 of his followers attacked and occupied the federal arsenal in harper's ferry. their goal was to capture supplies and use them to arm a slave rebellion. brown was captured during the raid and later hanged, but not before becoming an anti-slavery icon. abolitionist and insurrectionist

explanation:

during the pueblo revolt, father de mora hid most of the gold in the mine and covered the entrance. he tried to take some of the gold with him, but had to leave it behind in order to escape.