OUTLINE OF SCIENCE FOR THE SEVENTH 

 GRADE. 



THE SUN, STARS, AND PLANETS. VII. 



1. A brief summary of the facts stated under the same 

 topic in the work for the fifth and sixth grades. 



2. Gravitation. 



a. Causes weight. 



Experiment 1. Specific weight. 



b. Center of gravity. The plumb bob. (See 

 Section 84.) 



Experiment 2. The balancing horse and 

 tight-rope walker. 



3. Tides, (See Section 85.) 



a. Due to moon and sun, 



b. Time of. 



Experiment 3. Plotting height and time 

 of tides. 



4. Planets. 



a. The size of planets, 



b. Their distance from the sun. 



Experiment 4. Drawing the planets to 

 scale. 



5. Changes in the surface of the earth. 



a. Agents of weathering. 



b. Agents of erosion. 



Experiment 5. Effects of running water 

 The sand table. 



6. Changes in the surface of the earth. 



a. Due to plants and animals. 



b. Due to bacteria. 



7. Slowness of change in the surface of the earth. 



