8th Grade Science STAAR Benchmark Review

Front

What causes tectonic plates to suddenly move after being stuck?

Back

Unbalanced forces build up and are released when the plates finally move.

Front

What does Newton's 1st law state?

Back

An object at rest will stay at rest until acted upon by an unbalanced force.

Front

What does Newton's 2nd law state?

Back

The acceleration of an object depends on the mass of the object and the amount of force applied (F=ma).

Front

What does Newton's 3rd law state?

Back

For every action, there is an equal and opposite reaction.

Front

Which electromagnetic waves have the highest energy?

Back

Gamma rays are the most dangerous and have the highest energy.

Front

How do you calculate density?

Back

Density = mass/volume.

Front

What is the density of an object with a mass of 4g and a volume of 2cm³?

Back

Density = 4g / 2cm³ = 2 g/cm³.

Front

What are chromosomes?

Back

Structures within cells that contain DNA and genetic information.

Front

What is the role of the centromere?

Back

The centromere is the region of a chromosome where the two sister chromatids are joined.

Front

What are sister chromatids?

Back

Identical copies of a chromosome that are connected by a centromere.