🧪 CATEGORY 1: Matter (7.6A–C)
👉 What is an element?
A substance made of one type of atom
👉 What is force?
A push or pull
👉 What causes earthquakes?
Movement of tectonic plates
👉 Where does most energy in an ecosystem come from?
The Sun
👉 Which system brings oxygen into the body?
Respiratory system
👉 What is the difference between a physical change and a chemical change?
Physical = no new substance, Chemical = new substance forms
👉 What happens to an object when a force is applied?
It can change motion (speed or direction)
👉 Which boundary causes mountains to form?
Convergent boundary
👉 What is a producer?
An organism that makes its own food
👉 Which system transports nutrients and oxygen?
Circulatory system
👉 Classify: Rust forming on iron
Chemical change
👉 What is velocity?
Speed with direction
👉 What type of boundary is MOST associated with earthquakes?
Transform boundary
👉 What happens to energy as it moves through a food chain?
It decreases
👉 Which system fights pathogens?
Immune system
👉 Explain how compounds are different from mixtures
Compounds are chemically bonded; mixtures are physically combined
👉 If a car slows down, what happened to its motion?
It decreased velocity due to a force
👉 What happens when plates move apart?
Divergent boundary creates new crust
👉 Why do fewer organisms exist at the top of a food chain?
Less energy is available
👉 How do the respiratory and circulatory systems work together?
Respiratory brings oxygen; circulatory transports it
👉 A substance can be separated by physical means. Is it a compound or mixture? Explain
Mixture, because compounds require chemical changes to separate
👉 A graph shows a straight line increasing over time. What does this tell you about motion?
The object has constant acceleration (speed increasing steadily)
👉 Why do earthquakes release energy suddenly?
Stress builds up along faults and is released quickly
👉 Predict what happens if producers are removed from an ecosystem
The entire food chain collapses due to lack of energy
👉 Explain how the nervous, muscular, and skeletal systems work together in movement
Nervous sends signals → muscles contract → bones move