Into which units is the geologic time scale subdivided? a: relative ages b: absolute ages c: months and days d: era and periods

Ineed the answer to question 1 , i’m desperate

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

What was the first instrument to ever record an earthquake?