What is the answer to Ag + O2​

How does the viscosity of magma change as magma cools?

Which of the following is a chemical property of water at 4 c

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)