What was the dust bowl and it's two main causes?

Is all the elements on the periodic table found in nature? What plant helps with stomach cramps? What does the fluid bilayer do? What causes Poly X Females? How many liters in a fifth? What is the radioactive decay of an atom resulting in the decrease in the atomic number with no charge in the atomic mass called? Where do bacteria fix nitrogen gas? What processes could account for the movement of cytoplasm? Which parts of flower develop into seeds? How many people died in the great blizzard of 1978? Which country does sweet and sour chicken come from? What did the German scientist theodor schwann conclude? Is Swine Flu an organism? Describe the exchange of substances across the capillary cell membrane? Is it true that ultraviolet light carries more energy than infrad radiation? What type of bond is NaH? Devised and execute a strategy that would allow you to determine the distance to a lighting strike given a five second time difference between seeing the lighting and hearing the thunder? What is mesnt by destarching a leaf? How are continental rift magma and continental arc magmas different? Which planets in our solar system are more dense then earth?