Kelly wants to build a small koi fish pond in her backyard. What natural material should she line her pond with to make sure that no water leaks out of the pond through gravitational water flow?
A sand
B gravel
C. loam
D. clay

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.