Which of the following is true about chemical reactions. a. they are accompanied by changes in energy. b. they form new substances with new properties. c. both a & b
d. neither a nor b

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

What is i fracture in the crust called when land move up, down or sideways