Toolbox
-
A limiting nutrient is an element or compound that a living thing needs for growth or survival but which is not readily available in the quantity needed relative to other necessary nutrients. In natural ecosystems, phosphorus is often the...
-
Many scientific measurements of liquids or gases use the unit parts per million (ppm). This unit is a way of understanding what percentage of a mixture is composed of the element or compound you are studying. For example: if we have one million...
-
A science journal or science notebook is a way of keeping track of your questions, observations, and discoveries in an orderly manner that you may reference later. Unlike a formal report, however, a journal is a place to collect thoughts in a...
-
Systems and Cycles
Systems and cycles form an important part of science. A system is the setting in which cycles occur. A cycle can invlove changes in state, such as the water cycle: liquid to solid to gas and back again...