So my question isn't really about mathematics, its about earth science there just isn't a tab for science so sorry but here is my question, how did scientists use data to find out about the outer core of the earth?

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

How can you construct perpendicular lines and prove theorems about perpendicular lines

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb