When 200 grams of water cools from 50.C to 25C , the total amount of heat energy released by the water is ? A. 42 kJ
B. 21 kJ
C. 34 J
D. 17 J

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

What is happening when the water inside a kettle heats up and begins to boil