Which three observations are caused by plate tectonics? Similar fossils are found in Australia, Africa, and Asia.
Earthquakes occur frequently on the west coast of the United States.
An ocean current flows northward along the east coast of the United States.
There is a long string of underwater volcanoes in the Pacific Ocean.
The sand dunes in the Sahara Desert in Africa move across the landscape.

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.