5. Which of the following studies do you think would be most suitable for a computer model?
a. A study of how fast an epidemic disease could spread in a city.
b. A study of what life forms can be found in a local pond.
c. A study of how animals react to confinement in a zoo or wildlife park.
d. A study of how a new type of plastic could be used and what properties
it has.

The answer would be sand and gravel

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.