Question

give scientific reason.
a) plaster of Paris powder should be stored in moist proof container

b) sodium hydrogen carbonate is used as antacid

c) tungsten is used exclusively for filament of electric bulb

d) parallel arrangement is useful in electric circuits

Answer 1

The rest of our freshwater is found at the surface in streams, lakes, rivers and wetlands. Groundwater may be near the Earth's surface or as deep as 30,000 feet, according to the U.S. Geological Survey (USGS).