Under what circumstances did becquerel first notice the effects of radioactivity

The answer is 12, for the points

Answer(b) both involve the use of levers;

If you're looking for an even spread of clay, silt and sand, add a considerable amount of sand and some clay until the 3 even out". soil texture triangle. silty clay loam soil is approximately 20 percent or less sand, 25 to 40 percent clay, and 40 to 70 percent silt.