Define one kg mass , one meter , one second time
​

one kg mass refers to the total mass of irridiam plattinum rod kept in the Central beuro of weight and measurement of France at 0°celcius and

one atmospheric pressure.

One meter length refers to total length of irridiam plattinum rod kept in the Central beuro of weight and measurement of France at 0°celcius and

one atmospheric pressure.

One second time refers to total time taken by Ceassium-133 atom to complete vibratration of 91923631770 times...

.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

you click your profile picture in the top right corner and it says edit profile.