Orange trees growing in an orchard in California during the Great Depression. Walnut trees in a grove. Mountains surround a bean field. Clouds forming before a storm. Wheat stalks blowing in the wind. Lightning and thunder during a thunderstorm. Torrential rain floods a farmland. Soil erosion from flooding seen on a hillside. A farmer walks through land severely damaged by floods after a storm. A farmer and his wife survey the damage done to their orange grove after flooding. Various farmlands damaged by soil erosion. Muddy topsoil oozing and collapsing during heavy rain. Rain washing away the topsoil of land. Gullies forming from torrential rain. Topsoil being washed away in creeks. Rapids in creeks during heavy rain, pouring into rivers. Flood washing away an uprooted tree. Soil erodes from side of a river. Aerial view of topsoil pouring into the Pacific Ocean along the California Coast.
Views of well maintained farmland throughout the United States. Narrator emphasizes the importance of "conservation farming" to protect land.
A machine drop tests aircraft landing gear inside a German Aeronautical materials testing laboratory. A scientist observes the test. An impact test machine tests the landing gear tire. A materials testing machine simulates movement of the landing gear tire to test vibrations.
An aircraft propeller stands inside a German Aeronautical materials testing laboratory. Materials testing machine is turned on. The propeller is turned on soon after. The machine tests the propeller, turning at high-speed, until the propeller shatters. The propeller breaks into many pieces, with debris flying all over. A technician climbs down from ladder. Another propeller is tested under high speed. A German scientist is seen observing the propeller.
A materials testing machine drop tests a float member in a water tank inside a German Aeronautical materials testing laboratory during World War II. Water splashing as the aircraft float drops into the water tank. A German scientist in front of a Klemm Kl 25 light plane. The Klemm Kl 25 with strain being applied to wings and landing gear. The scientist tests the landing gear and wings of the Klemm Kl 25 airplane inside the hangar.
A German Luftwaffe military aircraft parked in front of a weather station in Germany in the late 1930s. A German man releases weather balloon at the weather station. The weather balloon flies away. A German Aeronautical scientist using telescopes to watch weather balloon’s flight. Scientists setting up equipment in garden. A scientist uses a camera to record a propeller running on high speed. A materials scientist pulls out a cross from the ground.