Answer:
The demand for salt was as high as gold at one time is because salt was necessary to preserve meat. The salt is a water permeable and subsequently expels water from any nourishment. Without water microscopic organisms don't duplicate and subsequently go about as additive.
Iowa has produced the most hogs, corn, and soybeans.
Answer:
primary waves pass through the outer core but shear waves do not.
Explanation:
The evidence which best supports the inference that the Earth's outer core possesses liquid characteristics is that, primary waves pass through the outer core but shear waves do not.
This ultimately implies that, the Earth's outer core possesses liquid characteristics because it allows primary waves only to pass through but not shear waves.
Because it had good sources of water and created silt which is fine soil for growing crops.