The diagram shows a ball resting at the top of a hill. Which statement best describes the energy in this system?
х
The potential energy in the system is greatest at X.
The kinetic energy in the system is greatest at X.
Total energy in the system decreases as the ball moves
from X to Y.
Total energy in the system increases as the ball moves
from X to Y.
Y.

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

your parents i think this could be it

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.