Describe lands and grooves found on a projectile. a. What is the difference between a land and a groove? b. Where on the projectile are lands and grooves located? c. What forms lands and grooves? d. What is the forensic significance of lands grooves?"

which statement about this sum is true? −245+2.7

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

battery with hi vtge high val resist in series

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.