4. name two nineteenth century scientists-one who developed the laboratory burner
in common use today, and the other who studied the spectra of colored flames
produced by a variety of elements,

common use today, and the other who studied the spectra of colored flames produced by a variety of elements. The two scientists are Robert Bunsen, whose name is associated with today's laboratory burner, and William Kirchhoff, who studied the flame spectra produced by a variety of elements. 4

Explanation:

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation: