Because ideas about evolution by natural selection have never been proven false, what term can be used to describe evolution by natural selection?

The correct answer is - the theory.

Explanation:

A theory is a explanation which is tested by all different experiments by the independently.  It is like a fact or well substantiated explanation. It is not a guess as it always supported by the evidences acquired by scientific method over course of the time.

The evolution by natural selection is a theory is it is not proven wrong or false and is supported by well substantiated explanations.

Thus, the correct answer is - A theory.

events in order:

1.       vishnu schist

2. zoroaster granite

3. bass limestone

4. hakatar   shale

5. igneous intrusion

6. shinumo quartzite

7. dox sandstone

8. tapeats limestone

9. bright angel shale

10. muav limestone

11. temple butte limestone

12. redwall limestone  

nonconformity

answer: the unkar group shows angular unconformity because the layers are turned at angle.

unconformity

answer: specifically the angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled. an angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled.

disconformity

answer: the disconformities aremarked irregular lines between the sedimentaryrocks layers.