Light
This is how light travels until it hits an object.
What are straight lines?
A push or pull on an object.
What is a force?
The physical property that determines if an object will sink or float in water.
What is relative density?
Living components in an ecosystem.
What are biotic factors?
These types of resources can be replenished naturally over time.
What are renewable resources?
When light bounces off a surface, this occurs.
What is reflection?
These two forces cause most landforms to develop on Earth's surface.
What are wind and water?
When iron filings and sand are mixed together, they demonstrate this key characteristic of mixtures.
What is maintaining their physical properties?
Non-living components in an ecosystem.
What are abiotic factors?
Coal, oil, and natural gas are examples of these.
What are nonrenewable resources?
When light passes from one medium to another and bends, this occurs.
What is refraction?
This type of force changes the shape of Earth's surface to form canyons over time.
What is water erosion/weathering?
Salt dissolving in water demonstrates this type of change.
What is a solution?
Webbed feet on ducks and hooves on horses are examples of these.
What are structural adaptations?
The formation of these resources begins with dead organisms.
What are fossil fuels?
When an object is not see-through.
What is opaque?
Testing how a force affects an object on a ramp is an example of this type of investigation.
What is an experimental investigation?
These three states of matter can change from one to another through heating or cooling.
What are solid, liquid, and gas?
How organisms interact with living and non-living factors in their environment to survive.
What are ecosystem interactions?
This process involves layers of sediment being compressed over time to form sedimentary rocks.
What is compaction/cementation?
Why we can see the image of a pencil appear bent when placed in a glass of water.
What is refraction causing light to bend as it moves between air and water?
When unequal forces act on an object, the object will move in the direction of the greater force.
What is an unequal/unbalanced force?
This is what allows for electrical and thermal energy pass through some objects.
What are conductors?
This cycle connects the Sun's energy, Earth's oceans, and weather patterns in a continuous process.
What is the water cycle?
These represent ways that humans can extend the availability of nonrenewable resources.
What is reduce, reuse, recycle?