Groundwater. Groundwater is stored in layers called aquifers.

The Big Dipper. The big dipper is the third largest of the recognized constellations.

Continuity Tester. A continuity tester determines if an electrical path can be established between two points.

29. The full moon is bracketed by a waxing and a waning gibbous.

The Floor. Lobsters use their antennae as sensors to navigate the murky environment at the bottom of the ocean.

Grass. A grasshopper would continue the food chain by eating the grass, then in turn, be eaten by a bird.