Regional pieces (“plates”) of the rigid outermost layer of the Earth (about 40 to 280 km thick, and generally thousands of kilometers across), consisting of the crust and outermost mantle.

Sheets of rock and/or sediment deposited approximately horizontally.

In geology, thin (less than 1 cm) layers of sediment produced usually by brief or periodic depositional events.

Visible features such as hills, valleys, or streams that appear on the Earth’s surface.