<span>Isohalines are lines (or contours) that join points of equal salinity in an aquatic system.</span>
<span>Movements of tectonic plates create volcanoes along the plate boundaries, which erupt and form mountains.</span>
<u>ANSWER:</u>
The statement "the extreme pressure and freezing temperatures of the deep ocean make it dangerous to send humans to the greatest ocean depths" best explains why scientists depend on submersibles to study ocean features .
<u>EXPLANATION:</u>
- The oceans are so vast and deep that humans cannot withstand the pressure in depths.
- Submersibles are developed in such a manner that they can travel to the deepest parts of the ocean and study ocean life.
- Submersibles are vehicles that have the capability to carry humans as well to the deep ocean floors or these can be controlled in an automatic manner.
- The submersibles are provided with tools and technologies that can record ocean floor features and make their study possible.
- The first three Chinese dynasties, the Xia, Shang and Zhou, are often referred as the '3 holy dynasties'.
- Qin Shi Huang, ruler of the Qin Dynasty became the first emperor of a unified China.
-The first dynasty established in China was the Xia Dynasty. Most of what is known about this early dynasty comes from legends.
