18. The figure below shows a U-tube. L-
ha
a) State what happens to the flow if the system above were put in a vacuum.
b) The density of Li and L, are 1.8g/cm and 0.8g/cm'. If h = 8 cm Determine h

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