Which statement described the ritcher scale select the options

Which element about russia in 1990s in not accurate

Combine like terms. do not forget to use the distributive property to simplify the first term. 2(3y + 5k) - 2k

What did the pattern of earthquakes in the wadati-benioff seafloor zones show scientists? a.) earthquakes occur where the ocean floor reaches its highest temperatures. b.) many earthquakes take place 700 kilometers below the seafloor. c.) slabs of ocean floor return to the mantle in subduction zones. d.) ocean - trenches cause earthquakes.