Origin of the Earth Teaching Model Item Type_Weights and connecting leads mounted on

and connecting leads mounted on 4mm-socketed bases for building circuits from 40-plus components

this bottle of coarse 20-mesh iron filings is a staple for classroom magnetism and field-pattern demonstrations

chrome metal frame and 75mm aperture pairing wide field of view with moderate magnification for reading tasks

and gas control on natural gas for high-temperature chemistry heating applications

giving quick-release gripping and angular positioning in one assembly

Origin of the Earth Teaching Model Item Type_Weights and connecting leads mounted onDepicts the geological processes of Earth's formation and the development of its structural layers, labeled on a wall mountable backboard.