Question

5) Nine hundred and eighty feet below the surface of Naica, Mexico, miners were excavating a new tunnel and found a cave filled with giant crystals. (6) The cave is a geological wonder because it contains some of the largest natural crystals ever discovered in the world. (7) Scientists and explorers studying the cave named it Cave of Crystals—for the surprises inside. (8) These crystals are Classified as selenite crystals, meaning they are translucent. (9) Most are between 20 and 36 feet long and weigh around 55 tons. (10) At first, scientists wondered how the crystals grew so large inside the cave. (11) Naica is on top of an ancient underground fault, which is a break in the ground where the tektonic plates of Earth have shifted. (12) Below the cave is a magma chamber filled with lava. (13) Over time, the cave was flooded with groundwater that trickled in from the surface. (14) With the water inside the cave and the heat from the magma chamber, the cave remained a consistent temperature for 500,000 years, and this created the perfect environment to grow crystals. (15) Scientists don’t know much about the crystals yet; the extreme conditions inside the Cave of Crystals make it dangerous to stay inside the cave for more than a few minutes at a time. (16) Because the magma chamber is right below the cave, the temperature is between 100°F and 150°F. (17) The relative humidity inside the cave is between 90% and 100%. (18) The average humidity in Mexico City is about 50%, making the cave’s humidity almost double the average of the nation’s capital. (19) In order to learn more about this impressive minerallogical discovery, scientists exploring the caves are working to develop strategies and tools that will help them stay underground longer


18. What change, if any, is needed in sentence 8? A.Change Classified to classified B.Delete the comma after crystals C.Change translucent to transluscent D.No change is needed. 19. What change should Jazmin make in sentence 11?A.Delete the comma after fault B.Change break to brake C.Change tektonic to tectonic D.Change have shifted to have shifts 20. What change should be made in sentence 19?A.Change minerallogical to mineralogicalB.Delete the comma after discovery C.Change exploring to explore D.Change them to it

Answer 1

Here are the suggested changes for each of the sentences in question:

**18. What change, if any, is needed in sentence 8?**
A. Change Classified to classified
**Answer:** A. Change Classified to classified. (Sentence should begin with a lowercase letter unless it is a title or the start of a sentence.)

---

**19. What change should Jazmin make in sentence 11?**
C. Change tektonic to tectonic
**Answer:** C. Change tektonic to tectonic. (The correct term is "tectonic" referring to the Earth's plates.)

---

**20. What change should be made in sentence 19?**
A. Change minerallogical to mineralogical
**Answer:** A. Change minerallogical to mineralogical. (The correct spelling is "mineralogical.")

Feel free to ask if you have any more questions!