A
Which layer of Earth has the least density?
A. inner core
B. outer core
C. mantle
D. crust
D. Crust
Jonas uses a pair of scissors to cut a piece of paper in half. What simple machine is used to cut the paper?
A pulley
B screw
C wedge
D wheel and axle
C. Wedge
A tsunami is....
A. a spinning windstorm that forms over the ocean.
B. a series of ocean waves.
C. a vibration deep within the Earth or at its surface.
D. when magma rises through the Earth's surface.
B. a series of ocean waves
Workers need to move some heavy tools to a roof several meters above the ground. Which simple machine would best help the workers lift the tools?
A. a wedge
B. a pulley
C. a lever
D. a screw
B. A pulley
The union of a sperm and an egg during the life cycle of a jellyfish is best described as
A. sexual reproduction.
B. genetic inheritance.
C. asexual reproduction.
D. genetic engineering.
A. sexual reproduction
The Law of Conservation of Mass (or Matter) states that
A. Mass (or Matter) cannot be created nor destroyed, just change forms.
B. Mass (or Matter) is infinite in the universe.
C. Mass (or Matter) cannot be transformed, but can be created or destroyed.
D. it is against the law for Mass (or Matter) to exist.
A. Mass (or Matter) cannot be created nor destroyed, just change forms.
A student uses a microscope to observe a single-celled organism that can move. The organism contains a nucleus and many chloroplasts. Based on the observations, the student claims the organism is not a bacterium. Which observation best supports the student’s claim?
A. The organism is unicellular.
B. The organism is able to move.
C. The organism has a nucleus.
D. The organism performs photosynthesis.
C. The organism has a nucleus.
In which layer of Earth are the temperature and pressure the highest?
A. crust
B. mantle
C. inner core
D. outer core
C. Inner core
Which is the best example of sexual reproduction?
A. A new plant cell results from mitosis.
B. Offspring receive genetic material from two parents.
C. A bacterium divides into offspring identical to the parent.
D. Daughter cells receive all the genetic material of a parent cell.
B. Offspring receive genetic material from two parents.
Which process can transform a sedimentary rock into a metamorphic rock?
A. melting and cooling
B. deposition and cementation
C. heat and pressure
D. evaporation and condensation
C. Heat and pressure
Which of these can transform metamorphic rock into igneous rock?
A. heat and pressure
B. melting and cooling
C. pressure and melting
D. deposition and cementation
B. Melting and cooling
Which of these describes a behavioral adaptation that will increase the probability that a species will survive?
A. A bird has brown feathers that help it blend with the ground where its nest is located.
B. A giraffe has long legs that help it reach leaves growing at the tops of acacia trees.
C. A moth has large dark spots on its wings that resemble eyes and scare away predators.
D. A mother bear stays with her cubs for a year and a half until they learn skills to live on their own
D. A mother bear stays with her cubs for a year and a half until they learn skills to live on their own
There are advantages to both sexual and asexual reproduction. Which of these describes the most likely advantage of sexual reproduction?
A. Sexual reproduction results in more variation among offspring, which may help them adapt better to changing environments.
B. Sexual reproduction ensures that all of the parents’ genes are passed on to the next generation.
C. Sexual reproduction is able to produce large numbers of offspring in a short amount of time.
D. Sexual reproduction increases the chance that an offspring will receive a harmless mutation from its parents.
A. Sexual reproduction results in more variation among offspring, which may help them adapt better to changing environments.
Earthquakes are caused by all of the following EXCEPT...
A. movement of tectonic plates.
B. tsunamis
C. volcanic activity.
D. underground collapses.
B. tsunamis
A person performed 100 newton-meters of work by moving an object into a truck with a ramp 5 meters long.
Force (f) = Work (w) ÷ Distance (d)
How much force was needed to move the object into the truck?
A. 120 newtons
B. 195 newtons
C. 105 newtons
D. 500 newtons
A. 20 Newtons
A natural hazard occurs when natural physical processes become...
A. Dormant and inactive
B. Extreme and unpredictable
C. Scary!
D. Faster than usual.
B. Extreme and unpredictable
Which human activity greatly increases the amount of carbon dioxide that is released into the atmosphere?
A. planting trees
B. composting leaves
C. draining wetlands
D. burning coal
D. burning coal
What is a potent greenhouse gas produced by farming practices, it is released during commercial and organic fertilizer production and use.
A. Carbon Dioxide
B. Methane
C. Nitrous Oxide
D. Chlorofluorocarbons (CFC's)
C. Nitrous Oxide
Which statement accurately describes the relationship between photosynthesis and respiration?
A. Both processes produce water (H2O).
B. Both processes produce oxygen (O2).
C. Carbon dioxide (CO2) produced by respiration is needed for photosynthesis.
D. Glucose (C6H12O6)is a reactant for photosynthesis and a product of respiration.
C. Carbon dioxide (CO2) produced by respiration is needed for photosynthesis.
A scientist wants to know if female guppies prefer to mate with male guppies when the males are more colorful. She divides a fish tank in half using a glass divider. She then places a female guppy in one side of the tank and takes turns placing differently-colored male guppies in the other side. She observes the response the female has to each male guppy. What is the dependent variable in this investigation?
A. size of the male guppies
B. color of the male guppies
C. amount of time each male is in the tank
D. female response to each male in the tank
D. female response to each male in the tank
A book falls off a desk and makes a sound when it hits the floor. The sound wave that travels through the air
A. is a transverse wave.
B. is a longitudinal wave.
C. moves in one direction from the source.
D. moves faster than the speed of light.
B. is a longitudinal wave
A company is manufacturing a platform to help painters reach high places. The platform is supposed to support up to 3,000 N. Which is the best way for the company to test the platform to make sure it supports the weight for which it was designed?
A. place objects on the platform that are slightly greater than 3,000 N
B. place objects on the platform that are slightly less than 3,000 N
C. release the platform holding 3,000 N from a given height
D. drop 3,000-N objects from a given height onto the platform
A. place objects on the platform that are slightly greater than 3,000 N