Which describes an impermeable rock where oil and natural gas deposits are found? O It traps the deposits inside them.
O It only allows certain materials to pass through
O It has pores large enough to allow absorption
O It is made up of porous materials.

Explanation:

Groundwater is stored in the open spaces within rocks and within unconsolidated sediments. Rocks and sediments near the surface are under less pressure than those at significant depth and therefore tend to have more open space. For this reason, and because it’s expensive to drill deep wells, most of the groundwater that is accessed by individual users is within the first 100 m of the surface. Some municipal, agricultural, and industrial groundwater users get their water from greater depth, but deeper groundwater tends to be of lower quality than shallow groundwater, so there is a limit as to how deep we can go.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong