Cells & Systems
What is the basic unit of life?
Cell
What % of Earth’s water is saltwater?
About 97%
What is a fluid?
A substance that can flow (liquid or gas)
What part of the EM spectrum can we see?
Visible light
What is work?
Force × Distance
What organelle makes energy for the cell?
Mitochondria
What is a watershed?
Area where all water drains to one location
What is a solution?
A homogeneous mixture
What does a concave mirror do to light?
Focuses (converges) it
What is mechanical advantage?
Load ÷ Effort
What is the difference between multicellular and unicellular organisms?
Multicellular = many cells, Unicellular = one cell
What causes ocean tides?
Gravity from the moon and sun
How can you speed up dissolving?
Stirring, heating, crushing
What lens corrects nearsightedness?
Concave
What are the three classes of levers?
1st, 2nd, 3rd
What system takes in oxygen and delivers it to the body?
Respiratory system
What’s the difference between point and non-point pollution?
Point = one source; Non-point = many sources
What is the formula for density?
Density = Mass ÷ Volume
What happens to light when it enters water?
It bends (refraction)
What does a hydraulic system use to multiply force?
Liquid
What is osmosis?
Movement of water through a membrane (high → low)
Name two landforms made by glaciers.
Moraine, esker, drumlin, kettle lake, etc.
What is viscosity?
A fluid's resistance to flow (how thick it is)
What part of the eye receives the image?
Retina
What is Pascal’s Law?
Pressure in a fluid spreads evenly in all directions