Great Rift Valley Africa Map PPT Africa's Great Rift Valley The Great Rift Valley Photos and Premium High Res Pictures Getty Images Rift Valley formation.pptx PPT PLATE TECTONICS PowerPoint Presentation, free download ID:203497 African Rift Valley Definition, Formation & Importance Lesson. Follows a week by week, letter by letter progression. Engages learners who prefer factual content. Uses strictly controlled text so only known letter sounds appear. Includes tricky words only after they have been introduced. Builds confidence as children master the phonics code. Features full color photography throughout. Provides book banded reading levels for use with other schemes. Library contains 72 reader titles, 12 at each phase level. Recommended for ages 46 (Pre K to Grade 2).