links for formative assessment Posted on March 27, 2019 by Mrs. Hussein Salina Intermediate Video #1: https://www.youtube.com/watch?v=Q3oItpVa9fs&feature=youtu.be Article: What is a Vacuum Video #2: https://www.youtube.com/watch?v=RjkrqMm52JI&feature=youtu.be Video #3: https://www.youtube.com/watch?v=MqF3pPU1Z4U&feature=youtu.be