Grade 8 Science Mid-Year Review

Front

What is the dependent variable in an experiment?

Back

The dependent variable is the variable that is measured or tested in an experiment. In the context of the spinach and blood iron levels experiment, it is the blood iron levels.

Front

What does density mean in terms of materials?

Back

Density is the mass of a substance divided by its volume. It determines whether an object will float or sink in a fluid.

Front

Which layer of the Earth is considered plastic (semi-solid)?

Back

The mantle is the layer of the Earth that is plastic (semi-solid) and allows for the movement of tectonic plates.

Front

What happens to the densest materials during the differentiation of Earth into layers?

Back

The densest materials moved to the center of the Earth during its formation.

Front

How can you determine which liquid is least dense?

Back

You can determine the least dense liquid by comparing their buoyancy; the liquid that allows objects to float more easily is the least dense.

Front

What is the relationship between the amount of spinach eaten and blood iron levels?

Back

Increasing the amount of spinach eaten is hypothesized to increase blood iron levels due to the iron content in spinach.

Front

What is the significance of seismic wave data in understanding Earth's layers?

Back

Seismic wave data helps scientists understand the composition and state of Earth's layers, confirming which layers are solid or semi-solid.

Front

What is the definition of buoyancy?

Back

Buoyancy is the ability of an object to float in a fluid, which is determined by the object's density compared to the fluid's density.

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.