How can the temperature stay the same is the substance was equally absorbing and releasing energy

Asap 1. which surface feature of the moon is characterized by mountainous areas? question options: maria terrae regolith craters 2.which statement describes surface features called maria on the moon? question options: layers of dust and rock deep areas of cooled lava deep, rocky and barren valleys highlands and mountainous areas

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.