Computer modelling Crossword

the concentration of dissolved salts in water
also known as the water cycle
an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
A type of satellite and a star sign
the average weather conditions of an area
machinery and devices developed from scientific knowledge.
the envelope of gases surrounding the earth or another planet.
that is a major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere
a person who is studying or has expert knowledge of one or more of the natural or physical sciences.
Arrived in the 1950s, helped with more accurate numerical weather predictions
the presence in or introduction into the environment of a substance which has harmful or poisonous effects
an instrument that measures and records details of earthquakes, such as force and duration.
a statement that the values of two mathematical expressions are equal (indicated by the sign =).
one which describes relationships that do not change with respect to time