This core has stayed hot over the billions of years since. Every kilometer you go down, it gets about 25 degrees Celsius hotter (or 1 degree Fahrenheit per 70 feet). The core will never freez over. Scientists estimate it would take about 91 billion years for the core to completely solidify. The sun will burn out long before that time!

Which two words would BEST replace estimate" and "solidity in the paragraph above?
(A) guess; freeze
(B) hope; set
(C) predict: harden
(D) assume, congeal

Aseries of connections of food chain in an ecosystem is called a what

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

Did you know that a blue wales tongue weighs more than an elephant?