Which one of these are examples of forced convection A. Hot tea warming the cup it is in
B. Blowing on a hot tea to cool it off
C. Burning your tongue on the hot tea

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements

well, i believe that the answer is 2. : 3

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.