Wait is this a real question
Because hot air is less heavy cold air is more heavy causing them to shift if cold air is placed on top.
The correct answer should be<span> D. It helped states create agricultural colleges to teach improved farming methods.
The act was designed to help teach farmers on how agriculture works better which is why they could study what was called "agriculture and the mechanical arts", at colleges.</span>
B - Nutrients
Explanation: Sunlight, sand, and glacial till would not be logical in this context.
