[Solved] Please: write down how rift valleys are formed draw a model Africa Rift Valley Diagram FORMATION Rollerball OF CONTINENTAL RIFT VALLEY Letters & Sounds Set 1 Non fiction Boxed Set. 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).