What does si stand for, when referring to a system of measurement

SI stands for International system of units

Explanation:

The SI system, is used around the world to remove bias and inequality of measured values. This made it possible to achieve unified measurements of quantities anywhere in the world by various conversion process. The seven basic SI units are:  kilogram (kg), meter (m), second (s), kelvin (K), ampere (A), mole (mol), and candela (cd).

b) returns freshwater to the earth.

c) returns freshwater to the earth.c) occurs after condensation.

d) returns freshwater to the earth.c) occurs after condensation.d) roughly equal to the amount of evaporation.

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