<span> There are two main methods of determining the salt content of water: Total Dissolved Salts (or Solids) and Electrical Conductivity. Total Dissolved Salts (TDS) is </span>measured<span> by evaporating a known volume of water to dryness, then weighing the solid residue remaining.</span>
Answer:
Plastics are made from natural materials such as cellulose, coal, natural gas, salt and crude oil through a polymerisation or polycondensation process. Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil.
Answer:
The Earth is made up of many rocky layers. .
Explanation:
The solid, outer layer is called the crust. Below the crust lies a layer of very hot, almost solid rock called the mantle
