STAAR Review 2024 8th Science

Front

What determines an element's identity?

Back

The number of protons in an atom, which is equal to the atomic number.

Front

What is the SI unit for force?

Back

Newton

Front

What is the difference between short-term and long-term events?

Back

Short-term events occur quickly and have immediate effects, while long-term events develop over time and have lasting impacts.

Front

How does a reduction in the snail population affect competition in an ecosystem?

Back

It increases competition between wood mice and shrews due to fewer available resources.

Front

What human activity has caused the greatest increase in polluted runoff?

Back

Illegal dumping.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

Define mass in scientific terms.

Back

Mass is the amount of matter in an object, typically measured in kilograms.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

Explain the concept of ecosystem competition.

Back

Competition in an ecosystem occurs when organisms vie for the same resources, such as food, space, or mates.

Front

What is runoff in environmental science?

Back

Runoff is the flow of water, usually from precipitation, that moves across the ground and can carry pollutants into water bodies.