Explain "What happens in the past helps us forecast the future" as it relates to tsunami's in this case.

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

Can someone me with questions 15 to 17 plz.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.