What can you do to avoid overexposure to sun's rays?

What is a metal replacement reaction

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

The three types is stress that act on earths rocks are compression, tension, and