An electron not only moves around the nucleus but also on its own axis, thus generating a tiny field. The direction of the field is described by the quantum number, ms, which is not related to any specific orbital but is a property of the electron itself.

law of conservation of matter

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.