1
special cells in the nose that respond to order particles
2
a scientist who studies weather
3
restrictions placed on potential solutions to a problem
4
the force of the weight of tiny particles of air
5
artificial body part
6
a model used to test a process or system by imitating it closely
7
characteristics used to describe an object
8
at risk of becoming extinct, or dying out
9
standards by which something is judged
10
a rubbing force that resists motion
11
the smallest part of a substance that displays all of the substance's properties
12
nutrients that occur naturally in rocks and soil
13
a group of living things with similar features that can reproduce together
14
to move from one place to another
15
a force of attraction between objects that is due to their masses
16
a wall of dense thunderstorms that surrounds the eye of a hurricane
17
material that returns to it's original length or shape after it has been stretched
18
a substance produced by the body that controls certain body functions
19
the layer of rock that forms Earth's outer surface
20
technology that uses radio waves to detect objects and their motions
