These are 10 Do Now - or Warm Up Activities- For an Earth science class. This is for students who are just entering the classroom to have about 5 minutes to complete in order to refresh their memory of a newly learned topic. Do NOW activities cover topics such as a geosphere review, hydrosphere, global warming, 3 ways to transfer energy in the atmosphere. These can be used as a transparancy in front of the class or individual worksheets for the students. Can be modified for older or younger students.