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DDT or Dichlorodiphenyltrichloroethane is a kind of pesticide that's colorless and tasteless in form. It has been a known pesticide used for agricultural purposes in the US.It was banned because of its known effects and impact to both humans and other living organisms. A book published by Rachel Carson entitled "Silent Spring" exposed the truth that DDT can cause cancer to humans and is an agricultural threat to wildlife, particularly birds like the bald eagle and the peregrine falcon who were almost near-extinction before the said pesticide was banned.
The 7.5 is a 100 times stronger than the 5.5 . The 100 comes from the increase in scale from 5.5 to 7.5 which is an increase of two so you multiply the strength of the weaker earthquake 10^7-5=10^2=100 and that gives you the strength of the stronger earthquake!
Gravity is the force that attracts to bodies toward each other friction is the resistance from one thing to another
Space ships.
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