The air above the surface of the Earth is the _____________.

All living things are part of the _____________.

All of the water on the Earth is part of the _____________.

The ___________ is everything that includes the Earth's surface and its interior.

There are many different gases in the air, and some of them make the Earth warmer as a result of the _____________ effect.

This system contains the least amount of material of Earth's four systems.

About ____ percent of the Earth's surface is covered with water.

Of all of the water on Earth, _____ is saltwater.

Precipitation in the water cycle includes ____________.

Water vapor is a _________.

____________ is the condition of the atmosphere at a place for a short period of time

___________ or how much air pushes on any surface, affects the weather.

Land heats up and cools down faster than bodies of water.

____________ is a large quantity of air that has similar temperature and moisture all through it.

The place where one air mass meets another air mass is called a _________.

Cold air can hold more moisture that hot air.

Clouds form when which two systems interact?

____________ are feathery clouds that form high in the atmosphere and are made of ice crystals.

____________ are storm clouds. They are dark and heavy and usually mean that a strong storm is approaching.

____________ are flat, gray, and layered. They are the lowest clouds in the sky and usually cover the whole sky.

____________ are fluffy and white with flat bottoms that form lower in the atmosphere than cirrus clouds do.

All snowflakes have ______ sides or points and has a different shape

____________forms when a frozen raindrop is pushed upward in rising warm air. More water freezes on it, and makes it a larger pellet of ice.

____________ small liquid water drops that lie close to the ground.

Fog forms when the _________________ interact.

Ocean water that flows from one place to another is called an ____________.

Wind is moving air. Air moves because Earth's surface is heated ____________.

Cold air rises because it is less dense.

Water and wind deposit soil in new places to build beaches, sand dunes, and other natural structures. These are examples of _______________.

________________ form when a chunk of land breaks off from a continent, a major land mass.

_____________ form when layers of lava build up until they appear above water and an island is formed.

_____________ form near coastlines when ocean currents deposit piles of sand and other sediments. Eventually the piles rise above the water's surface and become islands.

As corals reproduce, reefs grows larger. It grows upward in layers until it breaks through the water's surface. This is how ___________ are formed.

Weathering is the breaking down of rock by interactions with Earth's systems.

Weathering of rocks can be caused by ___________.

Glaciers gouge out rock when they move over it. These are examples of __________________ interactions.

Plant roots grow into cracks in rocks when the roots search for water, expanding cracks and breaking rocks. This is a ____________ interaction.

____________ is the loosening and carrying away of weathered material from one place to another.

Erosion may be caused by

When moving wind, water, and glaciers in the atmosphere and hydrosphere slow down, they drop the sediments they carry. This is called __________.

Soil is formed from parts of all four of Earth's systems.

Soil is made from ___________.

Soil can be formed in just a few days.