Earth is called the "_________" planet because it is not too hot or cold, not too wet or dry, not too windy or too calm. It is just right.

• Perfect

• Optimal

• Goldilocks

• Life

Weather occurs in which layer of the Earth's atmosphere?

• Troposphere

• Stratosphere

• Mesosphere

• Exosphere

The ___________ creates most of our weather

• atmosphere

• oceans

• land

• sun

The sun creates our weather

• when its rays strike the earth at different angles

• by fueling the process by which the ocean water turns into vapor

• by giving us seasons

• by sending uv rays to the earth

• by orbiting the earth

Earth has a _______________ field that helps to deflect solar winds.

• ozone layer

• magnetic field

• current

• atmospheric

Earth has a/n ___________ layer that

• allows water into the earth

• creates the heat of the earth

• blocks harmful solar radiation

• Keeps the earth rotating

Ocean currents, giant rivers flowing through the oceans

• are driven by the wind

• help through spread warmth more evenly around the planet

• warm currents make the north and the osuth much milder

• circulate in giant loops on either side of the equator

• bring cool, moint air to the tropical coasts

Earth's climate has been stable and mild for the last

• 1,000,000,000 years

• 1,000 thousand years

• 10,000 years

• 100,000 years

How many ice ages have occured in Earth's history?

• 10

• 5

• 20

• 2

Around how long ago was the most severe ice age?

• 500 million years ago

• 700 million years ago

• 200 million years ago

• 250 million years ago