Saguaro National Park, located in Tucson, Southern Arizona, is part of the United States National Park System.

A scalar quantity is one which has magnitude but no direction.

 A quantity, such as mass, length, or speed, that is completely specified by its magnitude and has no direction

Simple Harmonic Motion (SHM) is defined as the oscillatory motion of a particle whose acceleration a is always directed towards a fixed point and is directly proportional to its displacement x from that fixed point but in the opposite direction to the displacement.

A line graph that shows the general shape of the relationship between two variables. It will not have any points plotted and although the axes should be labelled they may not be scaled.

Soil pollution is caused by the presence of  human-made chemicals or other alteration in the natural soil environment.

Non-liquid, non-gaseous category of waste from non-toxic household and commercial sources.

The largest group of organisms where two hybrids are capable of reproducing fertile offspring, typically using sexual reproduction.

The rate of change of distance with respect to time.

The chemical compound with the formula SO2. At standard atmosphere, it is a toxic gas with a pungent, irritating, and rotten smell

These are the equations of motion for a body undergoing constant acceleration





where..
s = distance (metres, m)
u = initial velocity (metres per second, ms^-1)
v = final velocity (metres per second, ms^-1)
a = acceleration (metres per second squared, ms^-2)
t = time (seconds, s)

A special type of interaction between species. Sometimes beneficial, sometimes harmful, these relationships are essential to many organisms and ecosystems, and they provide a balance that can only be achieved by working together

 Junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.