why were dinosaurs so tall?

Hello thefirstqoe,

There are several possible explanations for why dinosaurs were so
tall.  Apparently there is no consensus as to the best hypotheses. 
Two pages that discuss various possibilities are:

"Why were dinosaurs big?"
The Straight Dope
http://www.straightdope.com/classics/a940408a.html

"Big Dinos," by Robert Coontz (from Muse, March 1999)
The Muse Magazine Fan Page
http://www.musefanpage.com/NewFiles/rjc_bigdinos.html

You can try this search to find additional thoughts on this topic:
 
"why were dinosaurs so"
Google
://www.google.com/search?q=%22why+were+dinosaurs+so%22&num=30

- justaskscott

The Biblical perspective is that every single thing, animal, tree,
mineral, planet, star ...anything we know of, was created by God. As
to 'how' we will never know [Isaiah 55;9] but as to 'why', it was for
our benefit. And we have a responsibility to look after it, the earth
[Revelation 11;18] The dinosaurs were put in place to fertilize the
earth. Common sense tells us that man, created later [Gen. 1;26] would
not be in any way compatible to survive in the same time frame
[Genesis 1;20,21,24...and every living soul...and moving animal and
wild beast...]