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1. Choose the word that correctly completes each sentence. (3 points)
Conglomerates and sandstones that are strongly cemented by
resist weathering longer than some igneous
rocks do
a. rate
b. silicates
C. clay
Shales that are not firmly cemented may break up to form
The
at which these sedimentary rocks weather depend
mostly on the material that holds the sediment grains together.
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Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.