If a crate has a weight of 50N on Earth, what is it's mass?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

Only 3% of the water on earth is usable by humans. even though that 3% is through the water cycle, we still need to be careful not to waste water.