Why is descartes considered the "founder of modern rationalism"?

Ineed a summary over the 6th amendment

Hurry what kind of texture will a conglomerate rock have? a. large-grained c. medium-grained b. fine-grained d. coarse-grained select the best answer from the choices provided a b c d

One of galileo’s contributions to science was a creating the coordinate plane system. b developing the scientific method. c improving the telescope. d inventing the astrolabe.