What is the mass of 10.5 moles of H20?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?