Four liters of helium are released into a weather balloon at sea level (pressure 101.3 kPa) To what volume does the balloon expand as it rises to an altitude of 20 km (pressure = 8
kPa)?

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d