2. (i) (i) Express 4.793 and 39.51 correct to
2 significant figures.
(ii) Use your answers in part (i) to estimate
​

I. 4.8; 40

II. 0.12

Explanation:

Given the following numerical values;

a. 4.793 (it is correct to 4 significant figures).

To 3 significant figures, we have;

4.793 = 4.79

To 2 significant figures, we have;

4.793 = 4.8

b. 39.51 (it is correct to 4 significant figures).

To 3 significant figures, we have;

39.51 = 39.5

To 2 significant figures, we have;

39.51 = 40

II. To estimate ;

;

answer; the nazca plate is converging with the south american plate

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.