Light and steady rain are due to a ________ moving in, because a warm air mass slowly climbs up over the cold air mass, so the weather is less intense.
What is warm front
100
Forces such as _______, _______ and ________ can change the surface of the Earth.
What is wind, water, ice
100
The Earth's _________ is responsible for the change in the shape of a shadow.
What is rotation
100
The ______ has no atmosphere, its surface is covered with craters, lava plains, mountains and valleys.
What is moon
100
Heat that is made naturally deep inside Earth is used for _______ energy.
What is geothermal
200
Earth has cold and warm air masses. When these air masses run into each other, the place where they meet is called a _____.
What is front
200
When moving water cuts through the Earth's surface, a ______ is formed.
What is canyon
200
It takes Earth 365 days to revolved or _______ the Sun.
What is orbit
200
The _______ supplies heat and light to Earth and is made up of many different types of gases.
What is sun
200
The Hoover Dam generates billions of hours of ___________ energy each year to serve electricity to millions of people.
What is hydroelectric
300
Rain, snow, sleet and hail are forms of _____.
What is precipitation
300
A river's flow slows down as it meets the ocean, causing its deposition of sediment to form a ________.
What is delta
300
It takes the Earth about 24 hrs. to ________ on its axis once.
What is rotate
300
The Earth and Moon share the characteristic of each being composed of ________.
What is rock
300
Fuel made from plants, animal wastes, and decomposing plant and animal tissue is known as _________.
What is bio fuel
400
Weather refers to the conditions outside on a particular day, whereas ________ refers to weather conditions for a region over a period of time.
What is climate
400
_________, _______ and ________ can cause rapid changes on Earth's surface such as creating new land, making cracks in the crust, or changing landforms.
What is volcanic eruptions, earthquakes and landslides
400
The seasons are caused by the ______ of the Earth on its axis as it revolves around the Sun.
What is tilt
400
The surface of the moon has many _________ that are caused by collision with meteorites.
What is craters
400
Energy that comes from changing the power of moving air into a useful form is ________.
What is wind energy
500
________ refers to daily environmental changes determined by four atmospheric factors: air, pressure, heat energy, wind and moisture.
What is weather
500
A glacier changes the surface of the Earth by building up _______.
What is valley
500
The day/night cycle and apparent movement of the Sun across the sky is a result of the Earth's _______________.
What is rotation on its axis
500
The _________ is rocky, covered by water and has few craters.