7. Calcule. a) mmc (14,21)
b) mmc (7.13)
c) mmc (15,20
d) mmc (24,60,96
8. Observe a imagem a segui​

Which statements about wells are true? check all that apply. a) wells bring groundwater from the unsaturated zone to the surface of the water. b) wells need to be drilled below the water table. c) if water is pumped from a well too quicky, the well may run dry. d) water from wells is generally not safe to drink. e) water gushes from artesian wells due to pressure.

As water is cooled from 4 c to 0 c its density

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire