This book provides an extended review on energetic particles interactions, propagation and acceleration in space plasmas. Its four chapters address key problems in CR Astrophysics and CR Geophysics. Chapter 1 briefly describes main properties of space plasmas and primary CR. Chapter 2 considers the problem of CR propagation in space plasmas. Chapter 3 is devoted to CR non-linear effects in space plasmas. In Chapter 4 different processes of CR acceleration...