Circle the letter of the sentence that is true about the law of superposition.
a. younger rocks lie above older rocks if the layers are undisturbed.
b. older rocks lie above younger rocks if the layers are undisturbed.
c. rock layers are never disturbed.
d. the youngest rock layers are typically at the bottom.

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

Which are forms of frozen water? check all that apply. dew frost hail rain sleet