Living Systems & Ecosystems
What part of a plant makes food?
Leaves
What are the three states of matter?
Solid, liquid, gas
What force pulls objects toward Earth?
Gravity
What is weather?
The condition of the atmosphere at a specific time
What is Earth’s main energy source?
The Sun
What is the job of roots?
Absorb water and nutrients and hold the plant in place
What is mass?
The amount of matter in an object
What is friction?
A force that slows motion
What is climate?
Long-term weather patterns
What causes day and night?
Earth’s rotation
What is an ecosystem?
Living and nonliving things interacting together
What is kinetic energy?
Energy of motion
What is potential energy?
Stored energy
What is erosion?
Movement of soil and rock by wind, water, or ice
What causes seasons?
Earth’s tilt and orbit
What is a producer?
An organism that makes its own food
What is a force?
A push or pull
How does energy move?
Through waves, heat, light, sound, or motion
What are Earth’s four systems?
Geosphere, hydrosphere, atmosphere, biosphere
What is a prototype?
A model used to test a solution
What happens if one part of a food chain disappears?
The ecosystem becomes unbalanced
What happens when forces are unbalanced?
Motion changes (speed or direction)
What happens to matter during a physical or chemical change?
It is conserved (not created or destroyed)
How do plants help reduce erosion?
Their roots hold soil in place
How do engineers compare solutions?
By testing, analyzing data, and using criteria and constraints