The two most abundant isotopes of boron are 10b and 11b, with 11b being about 4 times more abundant. in the mass spectrum of trimethylborate [(ch3o)3b], a. the peak at m/z 103 has an intensity which is 1/4 the intensity of the peak at m/z 104 b. the peaks at m/z 103 and m/z 104 have equivalent intensities c. the peak at m/z 103 has an intensity which is 4 times that of the m/z 104 peak d. none of the above

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

This large tectonic plate is bounded on three sides by whats know as the ring of fire. what is the name of this tectonic plate? a) pacific plate b) eurasian plate c) north american plate d) indo- australian plate plz it's science but there's no option for science so i picked chemistry