Science and Measurement
What is a hydrometer?
It is a device that measures the density of a liquid.
What is irrigation?
It is the process by which water is taken from one area and given to crops in another area.
What are the two main functions of the skeleton?
It supports the body and protects internal organs.
What kind of joint is the elbow?
A hinge joint.
Two objects have exactly the same size and shape. The one with the higher density will be ____________ than the one with the lower density.
Heavier.
What is erosion?
Erosion is the process by which rocks and soil are broken up and taken away by water.
What bone structure protects the main vital organs of the body, such as the heart and lungs?
The ribcage.
True or False: Hinge joints are very stable and allow for a wide range of motion.
False. Hinge joins allow for back and forth motion, while ball and socket joints allow for a greater range.
State the Law of Continuity.
When water flows through a pipe, the amount of water stays the same - even if the pipe gets skinny or wide. The smaller the opening, the faster it leaves.
What two things determine how much erosion occurs?
How much water flows and how quickly it is flowing.
What does the vertebral column protect?
The spinal cord.
What holds the bones in a joint together?
Ligaments.
Does the Law of Continuity work in all situations?
No. It only works when the water is being fed into a system at a constant rate.
True or False: If you have a pile of dirt and slowly pour water over it, the pile will immediately be washed away.
False. To immediately wash away the pile, lots of water needs to be poured quickly.
What is important about the shape of the vertebral column?
Its shape allows it to absorb the shock your body experiences from walking and running.
What is the name of the bone in the arm above the elbow?
The humerus.