'Presence' in the Bible

The mountains will melt under him and the valleys will split apart, like wax in the presence of fire and like water gushing down a steep incline.

God will stand up and break through in their presence. Then they will pass through the gate, going out by it. Their king will pass in front of them with the LORD at their head."

For I brought you up from the land of Egypt, and ransomed you from the house of slavery, sending Moses, Aaron, and Miriam into your presence.

How am I to present myself in the LORD's presence and bow in the presence of the High God? Should I present myself with burnt offerings, with year-old calves?