Science how do we know that some layers of the earth are solid and some liquid?

pls write at least 5 sentences

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

Which of the following best describes technology a. something created for only scientists to use b.the method of thinking that scientists use. c.the application of engineering to create useful products. c. a scientific idea