Rachel is researching the differences that exist in each layer of the Earth. Which of the following best describes Earths crust? 1. Liquid, metallic

2. Dense, extremely hot

3. Semisolid, convective

4.Solid, rocky
HURRY I ONLY HAVE 5 MIN LEFT PLEAS HELP I AM BEGGING YO

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Which change to the system wood cause the freely-moving piston to lower?

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?