Light and sound
Force and motion
Ecosystem
Solar system
100
Something you can't see through
What is opaque?
100
An object at rest tends to stay at rest
What is gravity?
100
An animal that is being attacked by another animal
What is prey?
100
Occurs when one body in space blocks light from  reaching another body in space
What is eclipse?
200
When light bounces off an object where you can see yourslf
What is reflection?
200
An object at mition tends to stay at motion
What is motion?
200
An animal hunting for its meal 
What is predator ?
200
The star and the center of our solar system
What is sun?
300
How loud something is
What is volume?
300
For every action there is an oppose reaction 
What is mass and weight?
300
Plants make food in a process that uses water,from soiled carbon dixiode from the air and engery from their sun light
What is photosynthesis?
300
One of the shapes the moon seems to have a sight orbits the Earth
What is moon phase?
400
Is thicker at the edges then in the center
What is concave lens?
400
How fast something is
What is speed?
400
The transfer of food energy between organisms 
What is food chain?
400
Is a body that revolves around a star
What is planet?
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