What is the function of the containment vessel?

Iwill give extra points to who gets this right

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest