Which best explains the relationship between the speed of sound and the medium through which it passes?

A Sound travels faster in solids because of the increased distance between solid particles.
B Sound travels faster in air because of the decreased dis

Which is composed of matter?

A electricity
B an atom
C light
D heat

Why does Earth have different seasons?

A because of the distance between Earth and the sun
B because of the speed of Earth as it rotates on its axis
C because of the amount of light blocked by the moon on its axis
D because of the tilt of Earth on its ax

A class is conducting an experiment on how different types of soil can affect the growth of a plant. Which are the main factors the class should consider when designing the experiment?

A the soil texture and the amount of water it can hold
B the types an

How could acid rain affect the trees living in a forest?

A It could strengthen the leaves of the trees in the forest.
B It could alter the soil quality, adding toxins that harm the trees.
C It could remove chemicals in the soil that harm the trees in the

How are earthquakes, sound, and light waves alike?

A They transmit energy.
B They carry matter.
C They travel in space.
D They can be seen.

How are the atoms in an object affected when the temperature of the object increases?

A They join together.
B They vibrate faster.
C They vibrate slower.
D They split apart.

A worker for an electrical company is preparing to fix a power line. Why would he put on rubber gloves before working with any power lines?

A Rubber is a poor conductor of heat but a good conductor of electricity.
B Rubber is a good conductor of heat but

Which best describes Earth’s crust?

A It is stationary and unable to move.
B It is thicker than the mantle and the core.
C It is located between the outer and the inner core.
D It is composed of continental and oceanic plates.

Why do seeds go through a period of dormancy?
A It allows time for the right conditions to occur before the seed germinates.
B It allows time for dry soil to accumulate before the seed germinates.
C It allows time for sunlight to appear before the seed g

Which best explains the relationship between the electromagnetic spectrum and sight?

A Visible light is the part of the electromagnetic spectrum that can be seen with the eye.
B Ultraviolet light is the part of the electromagnetic spectrum that can be se

Sarah has 100 g of each element listed in the chart below, which also provides the melting point for each element.

What would happen if she melted only 50 g of each element?

A The melting point for each element would double because the mass was changed.

Which represents information that is gained as a result of space exploration?

A weather and climate patterns that occur on Earth
B existence of the sun and the moon in the solar system
C how to use coal and natural gas as energy resources
D location of p

How does the anther help with reproduction of a flowering plant?

A It develops into a fruit after fertilization occurs.
B It moves pollen to the roots of the plant.
C It grows the seeds for the plant.
D It produces and stores pollen.

Which best summarizes the order of energy flow in a food chain?

A sun to decomposers to producers to consumers
B sun to consumers to decomposers to producers
C sun to producers to consumers to decomposers
D sun to producers to decomposers to consumers

What is the relationship between eyesight and light?

A Light shines on all objects, allowing people to see them.
B Light shines through all objects, allowing people to see them.
C Light enters the eye before striking an object, allowing people to see the

In which situation would the atoms in an object begin to move closer together during a phase change?

A Heat is removed as a gas turns into a liquid.
B Heat is removed as a liquid turns into a gas.
C Heat is added as a solid turns into a gas.
D Heat is ad

Why are some coffee cups composed of ceramic material?

A Ceramic materials are conductors that limit heat transfer.
B Ceramic materials are insulators that limit heat transfer.
C Ceramic materials are conductors that aid heat transfer.
D Ceramic material

Which causes the movement of tectonic plates?

A gravitational pull between Earth and the moon
B convection occurring beneath the Earth’s crust
C energy produced by earthquakes within the Earth
D rotation of liquid rock found within the core

Scientists were completing a six-week study of the number of salmon living in a local stream. During the study, the stream was contaminated with a toxic waste. The chart shows the weekly number of salmon living in the stream.

Which best summarizes the si

Josephine adds thicker strings to her guitar. What does that do?

A It prevents the guitar from using air particles to transfer the sound.
B It changes the number of strings on the guitar.
C It changes the vibrations made by the guitar.
D It prevents the

How does 250 mL of water compare to 500 mL of water?

A They have the same melting point but different boiling points.
B They have the same boiling point but different melting points.
C They have the same volume but different densities.
D They have the sa

Which best explains why the moon has phases?

A The moon’s position changes in relation to the sun and Earth.
B The sun’s position changes in relation to the moon and Earth.
C The Earth casts a shadow on the moon as it rotates.
D The moon rotates along it

Which most likely occurs when two continental
plates are pushed into one another?

A The plates will stop moving.
B The plates will form a trench.
C The plates will form a mountain.
D The plates will break into pieces.

A plant begins to bend when a tall building is built near it. Why does this occur?

A It is adjusting to changes in the temperature.
B It is growing away from the light source.
C It is adjusting to changes in the soil.
D It is growing toward the light sou