At track practice, a boy runs 10 m at 45° north of west, then 20 m at 12° south of west. What is his resultant displacement? Give the magnitude,
units, angle, and direction words.

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places