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a) the process of coating of a reddish brown layer on iron by moisture and air is called as rusting.
b) 78% nitrogen, 21% oxygen and 0.21 % carbon dioxide and other gases
c) vehicles, factories and burning of plastics.
d) a method of agriculture which uses water collected during rain to harvest the crops.
e)
f) the change of matter from one state to another.
g) compund is a homogeneous mixture of two elements.
a-The process of rust formation in presence of oxygen and water or water vapor is called rusting
b-By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
c-Agricultural activities. ...
Exhaust from factories and industries. ...
Mining operations. ...
d-Rain water harvesting is the process of collecting the rain water which used to run off from the roof tops, parks, roads, and tanks.
e-The dust in the atmosphere is the reason that our sky appears blue. ... Around dust particles, the water droplets form which makes it heavier and heavier until it falls. The water droplets cannot form until they are provided with something around which they can condense. Hence, dust provides the platform for condensation.
f-Interconversion of States of Matter. ... The phenomenon of the change of matter from one state to another and back to original state is known as interconversion of the sates of matter. Matter can be changed from one state to another by changing temperature or pressure.
g-A compound is a substance formed when two or more chemical elements are chemically bonded together. ... The type of bonds holding elements together in a compound can vary: two common types are covalent bonds and ionic bonds. The elements in any compound are always present in fixed ratios.