Blue green algae called ____ use sunlight to make their own food. They also add oxygen to the eath's atmosphere

Earth's atmosphere was formed by gases escaping from vents and _________.

Earth's earliest life forms appeared in the __________.

The layer of the atmosphere where people can live and breathe is the _____________.

Explosions from beneath the earth's surface are __________

When two plates collide and push upward, they create a _________.

Most of the water in the hydrosphere can be found in the Earth's ______.

The solid surface and interior of the earth is the ______________

The process of water moving from the air to Earth's surface and back into the air is the____________.

The process of water vapor changing from vapor to liquid is called ____________________.

Something that provides scientists with clues to the earth's past climate

Water that falls to the earth in the form of rain, hail, or snow

Warm climates usually have more ____ than cold climates

The ____ of a place is its long-term average of weather conditions

Halfway between the North and South Poles is an imaginary line called the ____________.

A large sheet of ice is called a ____________

A period of extrem cold is called an_______________.

A rock that contains a preserved imprint or remains of a plant or animal is called a ___________.

Earth's continents were once part of a single landmass called _______.

The young earth could not support life because__________________

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