Answer:
Hydraulic mining developed from ancient Roman techniques that used water to excavate soft underground deposits. Its modern form, using pressurized water jets produced by a nozzle called a "monitor", came about in the 1850s during the California Gold Rush in the United States.
Explanation:
Memorial day became a federal holiday in 1971!!!
The effect of Jays treaty is that it made trade easy with Britain while the french war was happening
Answer:
•What is variation?
<em>a change or difference in the amount or level of something</em>
•What is an adaptation? How are variations and adaptations related?
<em>The characteristics of an organism that help it to survive in a given environment are called adaptations. Adaptations are traits that an organism inherits from its parents. ... The variation may already exist within the population, but often the variation comes from a mutation, or a random change in an organism's genes.</em>
Explanation:
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Answer:
Black Thursday marked the day the Roaring 20s stock market bubble finally burst. This event ended a decade of rapid expansion of the U.S. stock market branded by wild speculation. ... Black Thursday and the subsequent stock market crash of 1929 led to the complete revamp of regulations on the U.S. securities industry.
Explanation: