- U Which best explains how gravity contributes to the formation of layers in protoplanets? O Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials. O Gravity causes materials to undergo radioactive decay, which produces heat and leads to the melting, sinking, and rising of materials. O Gravity absorbs heat, which cools materials and causes them to sink and rise. O Gravity releases heat into space, which cools materials and causes them to sink and rise. Save and Exit Next Submit Mark this and retum Plz help me i need help right now its a quiz​