Explain the difference between the two water systems and how this led to lead getting into the water. Consider any physical or chemical changes that occur that allow the lead to travel through the water

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

What natural processes produce large quantities of co2

Scientists often have to 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 number in an alternate form.