2022 STAAR Test 8th grade science part 4

Front

What is Alpha Centauri?

Back

Alpha Centauri is a star system that consists of three stars and is located approximately 4 light-years from Earth.

Front

What causes a coin to change its velocity when tossed in the air?

Back

The force of gravity causes the coin to change its velocity.

Front

What is the relationship between sea anemones and clown fish?

Back

Clown fish provide protection to sea anemones and help move water near them, which is important for oxygen levels.

Front

How do you calculate the number of neutrons in an atom?

Back

Subtract the atomic number from the mass number. For example, a fluorine atom with a mass number of 19 has 10 neutrons (19 - 9 = 10).

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion.

Front

Define abiotic factors in an ecosystem.

Back

Abiotic factors are non-living chemical and physical parts of the environment that affect living organisms.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What role does gravity play in motion?

Back

Gravity is a force that attracts objects toward each other, affecting their motion and velocity.

Front

What is a star?

Back

A star is a luminous celestial body made of plasma that generates energy through nuclear fusion.

Front

Explain the concept of ecosystems.

Back

An ecosystem is a community of living organisms interacting with their physical environment.