34. A compound which is prepared from gypsum has the properties of hardening when mixed with proper quantity of water. Identify the compound

and write its chemical formula. write the chemical equation for its preparation.

Mention any one use of the compound.

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Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.