Glacial periods are demonstrated by large drops in temperature and CO2 followed by a rapid rise. How many major glacial periods have there been in the last 400,000 years?

Asap 1. what happens to particles when a substance gains energy and changes state? 2. what happens to the energy that is lost when water freezes? 3. how does the movement of particles in a stick of butter differ from the movement of particles in a dish of melted butter? 4. as water is cooled, at what temperature do its particles become fixed in place? 5. how do evaporation and boiling differ?