The cycles within which earth's matter moves are closed systems. This means nothing is gained or lost from the system; it only changes from one form to the other. The total amount of matter on earth remains the same. Using tectonic plates as an example, divergent boundaries occur where new oceanic crust is being created. New crust is being created and simultaneously the same amount of crust is being destroyed at convergent margins.
1. evaporation because in the water cycle the water turns to water vapor during evaporation
Answer:
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
;
;
Water is the 30% of what earths surface is made of