These short notes are prepared by including all the important key points in the 4th unit- 'Ecosystems' which are important to the students in their exams. So, this study material can refer by the students to quickly...

Physics, Science, Middle school Keywords: Density, uphtrust (buoyancy), liquids, gases, pressure, floating, lifting, sinking, overall density, average density Presents the concept of upthrust, and how the relation...