Science STAAR 2025 review 1

Front

A rift valley occurs at a ____________ boundary.

Back

Divergent boundary: A tectonic plate boundary where two plates move away from each other, leading to the formation of rift valleys.

Front

How many Oxygen (O) atoms are in 2C₂HO₈Cl₂?

Back

16: In the chemical formula, there are 8 oxygen atoms in each C₂HO₈, and since there are 2 of them, the total is 16.

Front

Small consumers that are hunted and eaten by larger consumers are called?

Back

Prey: Organisms that are consumed by predators in the food chain.

Front

Most stars are made of which elements?

Back

Hydrogen and Helium: The primary elements that make up the majority of stars in the universe.

Front

What kind of galaxy is characterized by spiral arms?

Back

Spiral galaxy: A type of galaxy that has a flat, rotating disk containing stars, gas, and dust, with spiral arms.

Front

What is the process by which plants convert sunlight into energy?

Back

Photosynthesis: The process by which green plants use sunlight to synthesize foods with the help of chlorophyll.

Front

What is the basic unit of life?

Back

Cell: The smallest structural and functional unit of an organism.

Front

What is the force that pulls objects toward the Earth?

Back

Gravity: A natural phenomenon by which all things with mass are brought toward one another.

Front

What is the term for a substance that cannot be broken down into simpler substances?

Back

Element: A pure substance consisting of only one type of atom.

Front

What is the term for the change of state from liquid to gas?

Back

Evaporation: The process by which molecules in a liquid state gain enough energy to enter the gaseous state.