As plates move past each other, stress builds up. what happens when this stress becomes too much?

The rough edges of the plates get trapped on each other as they pass. This slows the motion on the border as the remaining plates continue to move. Pressure builds up, and when the plates get too much, the hard, fractured lithosphere breaks unexpectedly, possibly resulting in an earthquake.

I am joyous to assist you anytime.

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.