Loess is a very valuable resource. What characteristic of loess makes it so valuable?
A- Loess is rich in minerals
B- Loess contains bits of rock
C- Loess does not erode easily
D- Loess is very difficult to find

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.