What is the source of energy for an earthquake?
a.
heat from the asthenosphere
b.
the earth's magnetic field
c.
the building of volcanoes
d.
motion of tectonic plates

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Answer asap need to be answered 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 change to the system wood cause the freely-moving piston to lower?