Explore the Wonders of Science

What is the main function of the circulatory system?

• To digest food and absorb nutrients.

• To transport blood, oxygen, and nutrients throughout the body.

• To filter waste products from the blood.

• To regulate body temperature and produce hormones.

Which organ is responsible for filtering blood in the human body?

• Lungs

• Heart

• Kidneys

• Liver

What are the three states of matter?

• solid, liquid, gas

• plasma, vapor, foam

• gas, liquid, crystal

• solid, liquid, plasma

What happens to water when it freezes?

• Water expands and becomes less dense when it freezes, forming ice.

• Water evaporates completely when it freezes, leaving no ice behind.

• Water contracts and becomes denser when it freezes, forming steam.

• Water remains the same and does not change state when it freezes.

What is a lever and how does it work?

• A lever is a machine that requires electricity to operate.

• A lever is a simple machine that uses a rigid bar and a fulcrum to amplify force.

• A lever is a flexible rod that bends to create force.

• A lever is a type of pulley that only works vertically.

Can you name a simple machine that changes the direction of a force?

• Pulley

• Inclined Plane

• Wheel

• Lever

What are the four main layers of the Earth?

• Core, Shell, Surface, Atmosphere

• Crust, Mantle, Outer Core, Inner Core

• Crust, Mantle, Atmosphere, Lithosphere

• Lithosphere, Asthenosphere, Mesosphere, Exosphere

Which layer of the Earth is liquid?

• Outer core

• Mantle

• Inner core

• Crust

What is a chemical reaction?

• A chemical reaction is a process that transforms reactants into products through the rearrangement of atoms.

• A chemical reaction is the mixing of two substances without any change.

• A chemical reaction is a method of measuring temperature changes in substances.

• A chemical reaction is a process that creates energy without changing matter.

What are the signs that a chemical reaction has occurred?

• Water boiling

• Sugar dissolving

• Signs of a chemical reaction include gas formation, color change, temperature change, precipitate formation, and light emission.

• Ice melting