Physics
A student wraps twelve rubber bands around both of his index fingers, as shown in the picture. The student then moves his hands away from each other, stretching the rubber bands. Which of these explains the change in energy of the rubber bands as they are relaxed when the student brings his hands closer together?
The amount of potential energy increased.
The flow of an electric charge through a circuit is called?
electric current
Fireflies are insects with a glowing light inside their bodies. A chemical reaction produces this light. The light helps fireflies in several ways. A student claims that a firefly population experienced a change that made it impossible for the insects to flash their lights. What would happen because of that change?
The population would decrease, because the male fireflies could not attract mates without their lights.
Which of these are microorganisms?
algae / mosquitos / seaweed / bacteria
bacteria & algae
If oxidation is occuring what happens to the metal?
Rusting
Which of these best explains how frontal boundaries can lead to severe storms?
A. Cold air flows down the side of a mountain away from the ocean.
B. Cold air remains over an ocean for an extended period of time.
C. Warm air is forced up rapidly by a cold air mass. D. Warm air rises slowly over a cold air mass.
Warm air is forced up rapidly by a cold air mass.
An increase in volume that is caused by an increase in temperature is known as
Thermal expansion
Based on the information given, which biotic factor that changes annually most likely signals the birds to migrate?
M. loss of offspring
P. reduction of food sources
R. increase in the number of predators
S. number of female birds in the population
P. reduction of food sources
Select the three factors that may have caused this decrease in the rabbit population.
M. an increase in the predator population
P. an increase in the producer population
R. a disease in the rabbit population
S. a slight decrease in the rainfall
T. a decrease in the producer population
M. an increase in the predator population
R. a disease in the rabbit population
T. a decrease in the producer population
What is the difference between Chemical and Physical changes?
Chemical makes a new substance, Physical is the state of matter
4. _____ is the distance traveled divided by the time needed to travel that distance.
Speed
The path along which electricity travels.
a circuit
Which of these best explains how frontal boundaries can lead to severe storms?
A. Cold air flows down the side of a mountain away from the ocean.
B. Cold air remains over an ocean for an extended period of time.
C. Warm air is forced up rapidly by a cold air mass. D. Warm air rises slowly over a cold air mass.
B. Cold air remains over an ocean for an extended period of time.
Based on the jet stream map, how does the weather north of the jet stream affect the fall bird migration? M. The weather is warm and will delay migration.
P. The weather is stormy and will prevent migration. R. The weather is colder and will trigger early migration.
S. The weather is warmer and sunny and will delay migration
R. The weather is colder and will trigger early migration.
A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?
Chemical change
At 8:00 A.M. you leave home and walk 0.5 km to a friend’s house. At 11:30 A.M. you return home, then travel by car to the mall, which is 10 km away, and arrive at 11:41 A.M. What is the total distance traveled?
11 kilometres
Energy from the wind is used to turn windmills. These windmills then spin a generator and produce electricity. Which statement would not support the claim that wind energy is considered a clean, renewable resource?
M. Wind energy is produced naturally.
P. Wind energy is used without giving off greenhouse gases.
R. There is an abundant supply of wind energy available for use.
S. There are only certain places that are suitable for collecting wind energy
S. There are only certain places that are suitable for collecting wind energy
What are some human activities that have positive effects on the environment?
Reforestation
True or False?
Primarily, leaves are divided into two categories simple and compound.
True
Color is what type of property?
Physical
Forces that cancel each other out are called _____ forces.
balanced
_____ energy is the type of energy light has.
A. Electrical B. Thermal C. Radiant D. Potential
Radiant
Materials that can be broken down easily by decomposers are...
Biodegradable
What is the pigment in chloroplasts that performs photosynthesis?
Chlorophyll
What happens to the atoms of a substance in a chemical change?
Atoms bond together differently