The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in different parts of the Earth’s structure. The crust is made from enormous ...

Ask students what part of the Earth the eggshell represents ... Ask students to name the different layers of the Earth's interior using the egg as a model that represents the Earth.

When Maureen Long talks to the public about her work, she likes to ask her audience to close their eyes and think of a ...

All organisms on Earth ride upon a "ferrous wheel" made of different forms of iron that ... elements are moved from one part of an ecosystem (e.g., ocean, soil, atmosphere) where the element ...