In the 1930s, what happened to large portions of land in the United States, causing people to go hungry? A glacier moved across the central states, leaving behind ruined crops.
There wasn’t enough water for crops after extreme heat caused many of the nation’s rivers to run dry.
Wind eroded much-needed top soil from overworked farmlands, causing a widespread “dust bowl.”
The Colorado River carved up farm lands and formed the Grand Canyon.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)