Answer:
The earth system is itself an integrated system, but it can be subdivided into four main components, sub-systems or spheres: the geosphere, atmosphere, hydrosphere and biosphere. ... The atmosphere receives energy from solar radiation which warms the earth's surface and is re-emitted and conducted to the atmosphere.
Falling pressure indicates the mass of the atmosphere above a point is decreasing, which can happen as the result of various atmospheric processes. In general, weather systems with low pressure at their centers (called cyclones) are associated with unsettled weather (clouds and precipitation) and strong winds. So, I’m guess cold and wet air mass.
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The atomic number is the amount of electrons an atom has, therefore:
An atom with 66 as it's atomic number has 66 electron and 66 protons (if the atom is neutral, if not, things are different).
Hope it helped,
BioTeacher101