Question 1
Abrasion is usually confined to a zone that extends up to ________ above the ground.
◦ 1 cm (0.39 in)
◦ 1 m (3.28 ft)
◦ 5 m (16.4 ft)
◦ 10 m (32.4 ft)
Question 2
After water itself, what are the primary elements that occur in sea water?
◦ chlorine and sodium
◦ potassium and chlorine
◦ hydrogen and sodium
◦ sodium and magnesium