Review All Units

You have covered an incredible amount of science this year. Let's walk through each unit and recall the most important ideas before your big science day presentation.

Unit A — Living and Nonliving

• Living things grow, reproduce, respond, and need energy. Nonliving things do none of these.
• Plants need sunlight, water, air, and soil. They have roots, stems, leaves, and flowers.
• Animals live in habitats suited to their needs. People use their five senses to make observations about the world.

Unit B — Earth and Sky

• The Earth has land, water, and air. The sun gives us light and warmth.
• Weather types: sunny, cloudy, rainy, windy, stormy. Weather changes with the seasons.
• Clouds — cumulus, stratus, cirrus — form through the water cycle. The moon reflects sunlight.
• We must care for the environment: reduce, reuse, recycle.

Unit C — Materials and Matter

• Every object is made from a material chosen to match its job. Properties: hard, soft, waterproof, flexible, transparent, opaque.
• Three states of matter: solid keeps its shape, liquid takes the shape of its container, gas spreads to fill all the space.
• Objects sink if denser than water, float if less dense. Mixtures can often be separated.

Unit D — Human Body and Health

• Seven main body parts: head, neck, torso, arms, hands, legs, feet.
• Sense organs (eyes, ears, nose, tongue, skin) send nerve signals to the brain. Good hygiene, sleep (9–12 hrs), exercise (60 min/day), and nutrition keep the body healthy.
• Germs spread through droplets, surfaces, direct contact, and food/water. Handwashing breaks the chain.