Not sure of the question but if you mean by 'tentalcales extending upward' to be in caves as long tentalcales extending upward then the simple way to rember is 'Mites down, Tites up. By this I mean Stalagmites and Stalactites. Hope this is of help.
== == An upward fold in a rock formation is called an anticline.
It's a horizontal line with a vertical extending from the middle of it upward. Like an underscore-pipe-underscore, _|_.
Stalagmites are depositional formations found on the floor of caverns that extend upward. They are formed as mineral-rich water drips from the ceiling of the cave, leaving behind layers of calcite or other minerals that build up over time to create these formations.
A flat extending endlessly in all directions is called a plane.
Yes. The spinal bones over the shoulders are such skeletal structures.
Offeror
An upward moving current of air is called an updraft.
it is called a peninsula
The movement of a body part upward is called elevation. This typically refers to moving a body part in an upward direction, such as lifting the shoulders or raising the arms.
The upward force that makes corks, or any substance or object, float is called buoyancy.
this is called an estuary
supine