Nội dung sách Daily Science Grade 3

Big Idea 1: Living things have adaptations that help them survive in their environment.
Week 1: Why do flowers have different colors and scents?
Week 2: How do dolphins sleep without drowning?
Week 3: Why does a cactus have needles?
Week 4: Why do birds migrate?
Week 5: Unit Review

Big Idea 2: Plants have many parts. Each part does a special job.
Week 1: What's the difference between a fruit and a vegetable?
Week 2: How does a tree get water from its roots to its leaves?
Week 3: Why do dandelions turn white and fluffy?
Week 4: Why do leaves change color in the fall?
Week 5: Unit Review

Big Idea 3: Fossils tell us about the plants and animals that lived long ago.
Week 1: Where is the best place to look for fossils?
Week 2: How do scientists know how old a fossil is?
Week 3: Why are fossils of ocean animals found on mountains today?
Week 4: How does something become a fossil?
Week 5: Unit Review

Big Idea 4: Air is a gas that surrounds us, takes up space, and creates weather.
Week 1: Why can't you breathe in outer space?
Week 2: Why does a can of soda sometimes explode when you open it?
Week 3: Where does wind come from?
Week 4: How do birds fly?
Week 5: Unit Review

Big Idea 5: Light moves in a straight line until it hits an object. Light can be absorbed, refracted, or reflected.
Week 1: Why does it get hot in the car on a sunny day when it is cold outside?
Week 2: Why does a straw look bent in a glass of water?
Week 3: Why do things look backward in a mirror?
Week 4: How does a movie projector work?
Week 5: Unit Review

Big Idea 6: Electricity travels in currents. It can pull and push the things around it.
Week 1: Where does lightning come from?
Week 2: Why do people get a shock when they touch metal?
Week 3: How does a battery make electricity?
Week 4: How does flipping a switch make a light bulb light up?
Week 5: Unit Review