Answer:
They are named for the places where geologists first described rocks or fossils from that time.
Explanation:
The geological history of planet Earth is divided into multiple eras and periods. The divisions are based on some dramatic event that caused a significant change in a short period of time, thus creating an easy distinction between them. The purpose of the divisions is to be easier for the scientists to explore the past, to find it easier to describe fossils, rock strata, events, etc.
The names of the eras and periods of the geological time scale seem to be names that are familiar, at least to people in some regions, with slight changes at the end of the names. This is because the names of the eras and periods tend to be given by the places where geologists first described rocks or fossils from that time. As an example, we can take the Jurassic (named after the Jura Mountains), Devonian (named after the Devon), Cambrian (named after Cambria, which is the Latin name for Wales), etc.
Answer:
Option (1)
Explanation:
Isohyets- This are the lines that connects the points of equal amount of rainfall that occurs at any given period of time.
Contour lines- This are the lines of equal elevation.
Isotherms- This are the lines that connects the points of equal temperature.
Isobars- This are the lines connecting the points of equal atmospheric pressure.
Isogrids- This are a type of half hollowed-out structure that is created mostly from a single metallic type of plate with hard triangular rib like structures that are commonly known as stringers. This are very light and hard in comparison to other substances, This are very costly to build, so they are basically used for the applications that are usually related to the spaceflight and also used in the field of aerospace.
Thus, the isogrids are not a common type of isoline.
Hence, the correct answer is option (1).
When visiting a cave, it is important not to take any formations in the cave because : C) They took thousands of years to form, and should be left so others can enjoy them too. <span>Cavers care about the preservation of these beautiful caves and embrace the motto which they even revised to be cavern friendly :</span><span> “Take nothing but pictures, kill nothing but time, and leave nothing – not even footprints.”</span>
