Electromagnetism

This powerpoint is able to be edited to suit your needs. A simple introduction to electricity, magnetism, and electromagnetism including some of the simple investigations which are useful in middle grades instruction.
Found here =

https://www.teacherspayteachers.com/Product/Introduction-to-electricity-magnetism-and-electromagnetism-1858519

Ornithology - Introduction to Birds

A 50-slide presentation meant to be used over 2 or 3 days with supplemental activities or games. Day one could be the morphology and day two could be the taxonomy, or it could be easily taught in three sessions. Lots of creative commons licensed images. Covers 10 common orders of birds, introductory anatomy, and morphology.
Found here:
https://www.teacherspayteachers.com/Product/Ornithology-Introduction-to-Birds-1859467