Nêu phương pháp tách các chất trong hỗn hợp sau: a. Nước có lẫn cát
b. Nước và dầu ăn
c. Bột sắt và muối ăn
d. Nước và muối ăn

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Type the correct answer in the box. spell all words correctly.what is the correct term for living the most sustainable life you can within your current circumstances? when your are being as sustainable as you can within your current lifestyle, you are said to be sustainability.

What happens to isotopes that are unstable?