Problem: Renewable Energy Resource Sunlight Sunlight can be used to heat homes. It can also be used to produce electricity. This conversion is made possible by solar cells. However, solar energy may not always be practical. Some areas are just too cloudy. Example Solar panels on the roof of this house generate enough electricity to supply a familys needs. Moving Water Falling water can have a lot of energy. Its energy can be converted into kinetic energy. This energy can turn a turbine and generate electricity. The water may fall naturally over a waterfall or flow through a dam. A drawback of dams is that they flood land upstream. They can also reduce water flow downstream. Either effect may harm ecosystems. Wind Wind is moving air. It has kinetic energy that can do work. Wind turbines change the kinetic energy of the wind to electrical energy. Only certain areas of the world get enough steady wind. Many people also think that wind turbines are noisy and not very nice to look at.

Question: "What are some drawbacks of dams?"

Answer: "Harm eco system"

OPTIONS:
- no
- yes
Answer: yes

Problem: Have you are burned something on the stove or in the oven? Do you know why things burn? It all has to do with temperature. Changes in matter are affected by temperature. For example, what if you place a cake in the oven and you leave it in too long? What do you think will happen? Thats right, it will probably burn. The same thing will happen if the oven setting is too high and you apply too much heat. In either case, heat has affected the rate of change in matter. Its probably obvious that when the temperature is increased a chemical change, like cooking, will occur faster. What about a physical change? Are physical changes affected by temperature? Most of us have seen steam rising off a wet road after a summer rainstorm. This happens because the road surface is very warm. The warm road and warm air temperature causes the water to evaporate quickly. The liquid water is turning into water vapor, but it is still water. The evaporation of water is a physical change. So yes, temperature affects the rate that physical change occurs.

Question: "What can happen if you place a cake in an oven and apply too much heat or set the oven heat too high?"

Answer: "It will cause a rate of change of matter"

OPTIONS:
- no
- yes
Answer: yes

Problem: It is almost summer time. Spring has been very long and very rainy. Winter was very warm and very long. In the winter the snows falls on the ground. It covers all the grass. It covers all the trees. It covers all the flowers. In the winter, the chipmunk goes to sleep. The chipmunk works all summer long to gather enough food for the winter. The chipmunk gathers berries. The chipmunk gathers pine cones. The chipmunk drops the pine cones off our roof and rolls them to her favorite hiding place. Boom! Boom! Boom! The pine cones sound so loud when they drop off the roof! The snow melts away in the spring. It is off the ground in our yard by the month of May. In June, there is still snow on the mountains. The snow on the mountains is still there until July. In May the grass starts to grow. In June, the flowers bloom again. In July, we go swimming in the lake. We get to play all summer. We do not have to go to school. We do not have to gather pine cones for food. We get to play outside and we get to have cook outs. We are not chipmunks. We are children. Our mom makes us lemonade in the summer time. Our mom takes us to the beach. Our mom lets us have a lot of campfires. Our mom mows the lawn. It is summer time and now we play for 90 days and the chipmunk works for 90 days. In the winter we work and go to school and the chipmunk gets to sleep. I am glad it is summer and I am glad that I am a human child and not a chipmunk. I am glad that we get to be awake through all the seasons. I like spring. I like fall. I like winter. My favorite time of all is, for sure, summer!

Question: "What covered all the grass, trees and flowers?"

Answer: "The snow"

OPTIONS:
- no
- yes
Answer:
yes