Im so so so bored anyone wanna talk lol

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.

A2 cm object is 10 cm from a convex lens that has a focal length of 4.4 cm, the image is 8cm from the lensz the height of the image, to the tenths place is

Find the percent of change from 500 oz to 800 oz