Question

an artesian well draws water from what type of aquifer? confined aquifers perched aquifers unconfined aquifers bedrock aquifers

Explanation:

An artesian well is a well that taps into a confined aquifer. Confined aquifers are layers of water - bearing permeable rock or materials (like sandstone in the diagram) that are sandwiched between two impermeable layers (such as rock layers). The water in a confined aquifer is under pressure. When a well is drilled into a confined aquifer, the pressure causes the water to rise in the well without the need for pumping (in some cases, it can even flow out at the surface, as shown in the image with the water spraying out of the pipe).

• Perched aquifers are small bodies of groundwater that sit above the main water table, usually trapped by an impermeable layer, but they are not the type associated with artesian well - like behavior shown.
• Unconfined aquifers (not the case here) have water that is open to the atmosphere at the top (no confining layers above in the traditional sense of a large - scale confining system).
• Bedrock aquifers: While bedrock can sometimes contain groundwater, if they are not part of the confined system (with impermeable layers above and below), they don't have the same pressurized behavior characteristic of artesian wells from confined aquifers.

Answer:

confined aquifers.