Water
How much water is on our planet
71 percent
What is the function of reproduction
So that life can continue
what is an inclined plane
It's a flat surface with on edge higher than the other
Meaning of density
How much area is filled in a certain object
What is light
light is the form of energy that you can see
How much salt water does earth have
97%
What is the heart made out of
Tissues
What is a lever
It's a bar used for raising or moving objects while placed on a fulcrum
What are the three states of matter
Gas, liquid, and solid
What is an example of a natural light source
Sun
what kind of water does Earth have
Salt and fresh
What is the function of a revolving nose piece
It lets you see objects closer
Meaning of wheel and axle
It's a movable simple machine with wheels, and with a fixed point in the center
What is it called when solid is turned into gas
sublimation
Meaning of radiant energy
Energy that travels by radiation
Which type of water does humans have to rely on
Fresh water
What is the function of the cell wall
Maintains cell shape
What is a pulley
A simple machine with one or more grooved wheels connected by the rope
What is it called when liquid is turned into gas
vaporization
What is an example of an artificial light source
A bulb
Where can fresh water be found
Lakes,rivers,and ponds
What do cells need in order to work
Oxygen, water, and food particles
How do you calculate work
Work=Force x distance
What is a mixture
contains two or more pure substances
Which source of light is the most dangerous
Blue light