<span>The mountains were once seas. The land was forced up by tectonic motion when the mountains were formed. The Sahara also used to be a sea and has a valley full of the fossilized remains of an extinct species of whale. It is generally agreed upon that two plates colliding caused the uplift that created the mountainous zone. Same for the Himalayas.</span>
Answer:
Energy can not be created or destoryed but converted.
Answer:
The answer is C.
Explanation:
Halogens occupy Group 17 of the Periodic Table. This group contains six different nonmetallic elements.
