Here are some short science videos to watch to review concepts:
A Plant Story: http://www.safeshare.tv/w/lHssBgyIRo

The Photosynthesis Song: http://www.safeshare.tv/w/FxIpzwosDI

Soil Types and Soil Structure: http://www.safeshare.tv/w/RNHqgdePin

Simple Machines: http://www.safeshare.tv/w/rLBklDpOXZ

Complete and Incomplete Metamorphosis: http://www.safeshare.tv/w/RjkVzviiso

Weathering, Erosion and Deposition: http://www.safeshare.tv/w/oZyvHFJpZA

Physical and Chemical Changes: http://www.safeshare.tv/w/ZqjDKjGBrs

Open and Closed Circuits: http://www.safeshare.tv/w/EjqkRoPwTn

What Causes the Earth's Seasons: http://www.safeshare.tv/w/RtUpgyOSNV