Of course, this is balanced with gas content -- if the magma contains more gas bubbles, it will erupt more violently, and if it contains less gas, it will erupt more calmly.
A memorandum of understanding (MOU) is an agreement between two parties in the form of a legal document. It is not fully binding in the way that a contract is, but it is stronger and more formal than a traditional gentleman's agreement. Sometimes, the term is used as a synonym for a letter of intent, particularly in private law.
The Department of Defense (DoD) Voluntary Education Partnership Memorandum of Understanding (MOU) application system will soon be upgraded with a new tool that automates and streamlines the upload of program and associated tuition rate and fee information (initial launch October 1, 2015).