Backfilling is the right one

↦<u>N</u><u>a</u><u>t</u><u>u</u><u>r</u><u>a</u><u>l</u><u> </u><u>Resources</u><u> </u>are resources like water, air, coal etc. that exist on Earth without an kind of interference by humans. They are highly essential as they support life & the needs of different organisms.
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
꧁❣ ʀᴀɪɴʙᴏᴡˢᵃˡᵗ2²2² ࿐
Answer:
Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock. ... This changing of rock types is called the "Rock Cycle".
Explanation:
Hope this helps!
Ask most of the middle east
They will say "Water desalination".
Ask a survivor, he would say
"Distillation".
they erode rocks and stuff like that