A student wraps a wire around an iron nail then connects the wire to a battery. The nail attracts other nails and stick together. What force holds the two nails together?

What motion causes the pattern of day and night?

Water is inside a popcorn kernel. When temperature increases the kernel explodes. What change in state of the water takes place inside the kernel causing the volume to increase?

From which part of the plant does a bee get food?

What is the role of decomposers in a food web?

What would cause bicycle tires to feel warm on a cold day, after riding to the store?

Earthworms live underground and dig tunnels. This helps improve the soil so plants grow better. Which statement explains how earthworms tunnels help plants?

Students build a circuit with a buzzer and switch. the students close the switch, but the buzzer doesn't buzz. What could be the reason?

What is the function of the sunflower's seeds?

What causes a blue block to appear blue in the sunlight?

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