(HELP! ASAP)
Which of these best matches surface features with the processes that are responsible for their formation?

a) sinkholes, caves, and hills heating of ground water due to geothermal energy

b) geysers, hills, sinkholes groundwater erosion leading to deposition of minerals

c) sinkholes, caves, and hot springs chemical and physical actions of groundwater

d) geysers, sinkholes, and hot springs dripping of groundwater from the ceiling of an underground cave

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel