The source of the sun’s energy

physical science 8

The smallest of the following celestial objects is:a.a white dwarfb.a neutron starc.a planetary nebulad.the earthRelative to the average depth of the oceans below sea level,the average height of the continents above sea level is:a.greaterb.smallerc.about the samed.greater at low tide, smaller at high tideGlaciers produce which or more of the following?a.U-shaped valleysb.batholithsc.cavesThe source of the sun’s energy is:a.radioactivityb.nuclear fissionc.nuclear fusiond.combustion