What is the purpose and roles of the three branches of the federal government

The Legislative Branch is congress. They make the laws in the U.S.

The Judicial Branch of the U.S. government is the system of federal courts and judges that interprets laws.

The Executive Branch enforces the laws made by the Legislative Branch.

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the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.