Read the following excerpt:
(2) Thousands of years ago, the tiny coquina clam (donax variabilis) lived in the shallow waters of coastal Florida, as they still do today. These are the small pink, lavender, yellow, or white shells one sees along the beach at the waterline. As the resident clam died, the shells accumulated in layers, year after year, century after century, for thousands of years, forming submerged deposits several feet thick. During the last ice age, sea levels dropped, exposing these shell layers to air and rain. Eventually, the shell became covered with soil, then trees and other vegetation. Rainwater percolating through the dead vegetation and soil picked up carbon dioxide and became carbonic acid, the same ingredient that makes soda fizz.
(3) As this weak acid soaked downward, it dissolved some of the calcium in the shells, producing calcium carbonate, which solidified in lower layers, much like how flowstone and stalactites are formed in caves. This material "glued" the shell fragments together into a porous type of limestone we now call coquina, which is Spanish for "tiny shell."
Based on paragraph 3, what is true about calcium carbonate?
A. It is made from limestone.
B. It helps bond materials together.
C. It dissolves calcium in shells.
D. It solidifies when placed in caves.
Answers: 3
English, 22.06.2019 01:00, edenlbarfield
What is the best prediction of the meaning of thrilling based on the context clues?
Answers: 3
English, 22.06.2019 01:00, smilequi9653
The boy and the wolf by james baldwin one day word came that a savage wolf had been seen in the forest. "how i should like to meet that wolf," said little gilbert. he was only seven years old, but now all his thoughts were about the savage beast. "shall we take a walk this morning? " asked his mother. "oh, yes! " said gilbert. "perhaps we may see that wolf among the trees. but don't be afraid." his mother smiled, for she felt quite sure that there was no danger. what point of view does the author use in this selection?
Answers: 2
English, 22.06.2019 05:30, lifewkeya
Sign wet paint when you see this sign, what will you say to other people that is going to sit? a. you must stay away from the area because it is under construction. b. you must not sit on the bench, so just stay away from it. i’m just not sure which one is correct
Answers: 2
Read the following excerpt:
(2) Thousands of years ago, the tiny coquina clam (donax variabilis) l...
Mathematics, 09.06.2021 01:00
Mathematics, 09.06.2021 01:00
Mathematics, 09.06.2021 01:00