People are always looking for ________ and _________ ways to do things.
What are easier and better?
100
When people want a better solution, they have to first ____________________.
What is identify the problem?
100
Many changes make people's lives __________.
What is easier?
100
an energy source that renews itself and never runs out
What is renewable resource?
200
The process of breaking down or wearing away.
What is erosion?
200
The answer to a problem.
What is solution?
200
After someone has identified a problem, they are ready to take the second step: _______________.
What is make observations and identify facts?
200
The positive effects of trains and automobiles.
What is people could travel faster and farther?
200
A renewable resource that uses windmills to make electricity
What is wind?
300
An example of something in nature that erodes mountains.
What are wind, rain, or snow?
300
In the early 1800s, people used this to power boats and trains.
What is steam?
300
Once someone has observed and identified facts, he or she is ready to ___________.
What is find a solution?
300
The negative effect trains and automobiles.
What is pollution?
300
A renewable energy resource that uses solar cells to store electricity
What is solar power?
400
This causes large waves that can erode a shoreline.
What is a hurricane?
400
People turned to _________ as an energy source after realizing that cutting wood was hard work.
What is coal?
400
After someone has found a solution to a problem, they finally must ___________.
What is prove a new fact?
400
When coal and oil are removed from the ground, they can pollute and harm nearby ___________.
What is land or water?
400
Most cars today run on gasoline and pollute the environment. One type of car that does not pollute the environment, but runs on batteries instead is called _______________.
What is an electric car?
500
If you wanted to record the changes in the height of a mountain, you would record the _______ and _________.
What are height and elevation?
500
Coal was dirty and dangerous to mine, so people started using _______ as their energy source.
What is oil?
500
Samuel Morse invented the __________ to help solve the problem of it being difficult to communicate over long distances.
What is the telegraph?
500
When oil and coal are burned, they give off ______ that pollute the air and water.
What are gases?
500
This type of car uses both gasoline and electricity to power the car.