Which best describes the changes occurring to the earth's surface over time? A. Mountains are gradually being worn down, but no new ones are formed

B. New mountains are being formed as old mountains are gradually worn down

C. More mountains are gradually formed as the oceans recede.

D. New mountains are only formed under the oceans.

How many moles of oxygen react with 12 moles of aluminum

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Which of the following will cause an increase in the acceleration of an object? increase force decrease force increase mass decrease mass