In recent years, many products that people use have released chemicals into the air. This has slightly changed the composition of the air that surrounds the planet.

TRUE

Explanation:

In the recent years, due to industrial revolution and industrialization, there are many products in the market which are harmful to the surrounding atmosphere or the product releases harmful toxic gases in the atmosphere.

For example, motor vehicles releases carbon dioxide as well as methane to the atmosphere which surrounds the air and it increases the temperature of the planet.

The flourine and the chlorine gases which are released from the refrigerators and the air conditioners mixes with air and depletes the ozone layer.

Also due to pollution, sulphur content is present in the surrounding air and it results in acid rain.

Thus it is true that many products which people uses in their daily life releases some chemical compounds in the air.

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.