7th Grade EOC Review

Wind, water, and ice are often involved in weathering and erosion, which can cause changes on Earth. However, weathering and erosion are different processes. Which of the following statements best describes how these two processes differ?

• Weathering is a much quicker process than erosion.
• Weathering breaks rocks apart, while erosion moves rocks or sediment from place to place.
• Weathering moves rocks and sediment from place to place, while erosion breaks rocks apart.
• Weathering moves rocks without breaking them, while erosion breaks rocks apart before moving them.

Earth has a great variety of surface features that are caused by weathering and erosion. Which of the following describes a change due to weathering?

• Ocean waves washing sand off the beach
• Rivers carrying soil and rocks through valleys
• Wind blowing sand and pebbles off of a sand dune
• Tree roots breaking rocks into smaller pieces of rock

The foods we eat provide energy. Which type of energy do we get from our food? 

• Heat
• Electrical
• Chemical
• Mechanical

Beth is conducting an experiment to determine how often she should fertilize her bean plants so they will grow quickly. She is going to test four plants as shown in the table. Which variable is Beth testing?

• Brand of fertilizer used
• Amount of fertilizer used
• How often the plant is fertilized
• Time of day the plants are fertilized

Delilah followed these steps of an investigation:
1. Collect five objects made of different types of metal.
2. Place them on a large laboratory table.
3. Touch each metal object with a magnet and lift slowly.
4. Record observations.
Which of the following statements is Delilah most likely testing?

• All types of metal are attracted to magnets.
• Each magnet can lift the metal objects to the same height.
• Larger magnets can pick up heavier metal objects than smaller magnets.
• Heaver metal objects are more attracted to magnets than lighter metal objects are.

Frank uses a bowling ball to demonstrate how energy can cause changes. Which of the following actions would NOT demonstrate a change caused by applying energy to the ball?

• He holds the bowling ball in both hands.
• He spins the bowling ball with one hand.
• He rolls the bowling ball across the floor.
• He lifts the bowling ball to place iton a shelf.

Isabelle classified some objects as conductors or as insulators. She made this chart to organize and record her data. Which item is classified incorrectly?

• Aluminum Foil
• Paper Clip
• Toothpick
• Wooden Block

5) Many people take vitamin C when they feel they are catching a cold. In fact, some people seem to recover more quickly when they take C vitamins.
What is the main problem with concluding vitamin C helps you fight off a cold based on this information?

• We cannot know exactly how vitamin C works.
• We cannot keep track of how much vitamin C people take.
• We cannot know how long the cold would have lasted without the vitamin C.
• We cannot know what other changes in diet people may have made while sick.

Tom is creating an experiment to see what food his pet lizard likes the best. He creates an experiment in which he offers his lizard a choice of crickets or mealworms. He records how much of each choice is eaten each day. At the end of two weeks, Tom finds the lizard has eaten a few more mealworms than crickets.
What must Tom do to be sure his results are valid?

• include another food option besides crickets
• repeat the same experiment to confirm his results
• buy additional lizards and begin multiple experiments
• feed only mealworms for a while then offer a choice again

Erosion and weathering can both cause changes to the surface of Earth. Which of the following only happens because of erosion and not because of weathering?

• rocks form deep underground
• rocks become smooth and round
• rocks are broken into small pieces
• rocks are moved from one place to another