The ozone layer protects living organisms on earth by

reflecting all solar energy coming toward earth
blocking solar ultraviolet (uv) radiation
blocking solar infrared (ir) radiation
absorbing incoming gamma radiation

Chalk is an ionic compound. which is a property of all ionic compounds that makes chalkboard? particularly useful for writing on a a high melting point hardness and brittleness inability to dissolve in water a multicolored appearance

What happens when the cell copies its chromosomes

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called