________________ is a low area between hills or mountains typically with a river running through it.

A __________ is on a map, which shows a network of horizontal and vertical lines that are superimposed, for locating points.

A __________ is a deep cleft between cliffs resulting from weathering and the erosive activity of a river over geologic timescales.

A flat, sweeping landmass that generally does not change much in elevation is called a _________.

Imaginary lines extending around the Earth parallel to the equator are called _____________.

A natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake is commonly referred to as a ________.

A ________ is a landform that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or standing water.

A partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea is called an ___________.

An opening in Earth's crust that allows molten rock from beneath the crust to reach the surface is a ____________.