Kahn Academy: Online science tutoring help. You may use these links, or search to find what you need clarifiication in.
Plate Tectonics:
https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/structure-of-the-earth
https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/plate-tectonics-geological-features-of-convergent-plate-boundaries
Rocks:
https://www.khanacademy.org/partner-content/mit-k12/mit-k12-biology/v/rock-cycle
Renewable Resources:
https://www.khanacademy.org/partner-content/nova/energy/v/neverendingsupply
Geologic Time:
https://www.khanacademy.org/science/biology/crash-course-bio-ecology/crash-course-ecology-2/v/crash-course-ecology-01
https://www.khanacademy.org/partner-content/big-history-project/solar-system-and-earth/knowing-solar-system-earth/v/bhp-intro-geologic-timechart
Volcanoes:
https://www.khanacademy.org/partner-content/amnh/earthquakes-and-volcanoes/volcanoes/e/quiz-volcanoes
https://www.khanacademy.org/partner-content/amnh/earthquakes-and-volcanoes
Fossils:
https://www.khanacademy.org/partner-content/nova/evolutionlab/evolution-101/v/fossils-rocking-the-earth
Radioactive Dating:
https://www.khanacademy.org/science/chemistry/nuclear-chemistry/radioactive-decay/v/half-life
Food Chains:
https://www.khanacademy.org/science/biology/crash-course-bio-ecology/crash-course-ecology-2/v/crash-course-ecology-07
nteractionshttps://www.khanacademy.org/partner-content/CAS-biodiversity/why-is-biodiversity-important-ca/biodiversity-and-ecosystem-funct/a/ecological-interactions
Earthquakes:
https://www.khanacademy.org/partner-content/amnh/earthquakes-and-volcanoes/earthquakes/a/earthquakes-101
https://www.khanacademy.org/partner-content/amnh/earthquakes-and-volcanoes/earthquakes/e/quiz-earthquakes