Rocks break and decay over time. 

Accumulation of sediment at the mouth of a river. 

Process of removing salt from ocean water.

Works across the hill, rather than up and down the hill 

Places on earth's surface where the crust stretches until it breaks

An elevated flatland that rises sharply above nearby land on at least one side

Water found below ground

Salt buildup in the soil

Liquid rock within the earth

First and smallest streams formed from the runoff of a mountain, eventually forming rivers

Near the surface, bacteria, insects, and worms break down the plant and animal material into this mixture

Deep valley marking the plate collision

The level at which all the spaces are filled with water

A condition in which the soil becomes nearly useless for farming

The plates slowly move across the upper mantle, usually less than an inch per year

A fan-shaped deposit of mud and gravel often found along the bases of mountains

Thick masses of ice

Artificially supplied to the land

Movement of water through the Hydrosphere

The zone that has the most of Earth's mass

The movement of surface material from one location to another

A region drained by a river and its tributaries

The downward movement of minerals and humus in soils

This explains how forces within the planet create landforms

Any small stream or river that flows into a larger stream or river

Planting different crops in alternating years

Polluted rain that can damage trees and kill fish in the lakes

Areas where continental surfaces extend under the shallow ocean water around the continents

Places where rock masses have broken apart and moved away from each other 

The new planting of trees after an area has been cut

Places where rocks have been compressed into bends

The destruction or loss of forests

The world's flattest and smoothest regions

Weathering breaks rock into smaller particles of gravel, sand and mud

The entire region drained by a river and its tributaries

Any landscape that is covered with water for at least part of the year

Forms where a river meets an inlet, or small arm of the sea

Heat of Earth's interior

Mineral bearing rock

Include the raw materials for many explosives, food additives, medicines, pesticides, and plastics

Artificial channels for transporting water

Electricity produced by moving water

Groundwater that is not replenished by rain

Rock layers where groundwater is plentiful

They were formed from the remains of ancient plants and animals

What is the study of Earth's physical structures and the processes that have created them?

Scientists believe that about ___________ million years ago all the modern continents were part of one supercontinent called Pangea

When two plates on the ocean floor one slids underneath the other.  This plate bounary is called a _________ zone

As water vapor rises with the air, it cools and forms tiny droplets in a process called?

Water falling to the surface, either as rain, snow, or hail is called  ____________.

When heated by solar energy, water may change to vapor.  This is called 

What was the first fossil fuel to be used as a major energy source?

Chemicals can interact with sunlight and create a mixture called _________________.