They are electromagnetic waves because mechanical waves have to be physically created by something, while electromagnetic waves are just emitted without any effort or force.
Answer:
a) find jobs and housing
Explanation:
People who generally migrate from rural to urban areas are seeking better jobs and housing.
These group of people can be characterized by their drive to attain a better standard of living.
- Rural areas offers little opportunity outside of agricultural practices.
- People from these rural communities have different skills and some are bereft of skills.
- They all one goal which is to find better jobs and housing.
Answer:
What should be <u>TRUE</u> of the island of <em>Hawaii</em> :
- Scientists in search of ongoing speciation events are more likely to find them here than on the other six large islands.
- Its species should be more closely related to those of nearer islands than to those of farther islands.
- It should have a rich fossil record of terrestrial organisms.
Explanation:
In cases of <em>geographic isolation</em>, and subsequent speciation, produced by dispersal and colonization phenomena we can find the island of Hawaii. Adaptation to these environments can be the trigger for divergence. The <em>large number of species</em> in this archipelago, more than 500, seems to have emerged through<em> migration</em> and diversification. Many of these are endemic to a nearby island, and the subsequent<em> evolutionary divergence.</em>
The volcanic islands, which have never been in contact with the continent, are especially<u> rich in endemic species; </u>the species that inhabit them are descendants of those who arrived in times past and <u>were able to adapt.</u>
Almost ninety years ago, in the south of the island of Hawaii, they revealed some <u>bones </u>that turned out to be the<u> first bird fossils discovered i</u>n the archipelago. The bones were under a flow of prehistoric lava and on a bed of volcanic ash.
In short, the Island of Hawaii is of great interest to scientists and there are always new developments buried years ago by volcanic activity.
The index fossils are fossils that are found in the rock strata of certain geologic period, but they are also fossils that are very common and can be found in numerous places around the globe.
Because they can be found all over the globe, and they are indicative of certain geologic period, the geologists have started to use them as a simple way of determining the age of the rock strata. While this method can not provide the geologists with an accurate year for the formation of the rocks, it is still able to determine the relative age of the rocks. By determining the relative age with such ease by using the index fossils, the geologists are able to immediately make conclusions about the rock strata, have basic information about it, and largely be aware of the processes that formed them and influenced them.
Oceanic and continental plates are colliding.
Explanation:
On the image, we can see an oceanic plate on the left, and a continental plate on the right, moving toward each other and colliding. Because the two plates have different densities, thickness, and elevation, one of the subducts below the other, that being the oceanic plate. As the oceanic plate subducts below the continental plate, it gradually moves down in the mantle layer, getting melted, recycled, and maybe the same material be pushed toward the surface again.
On the plate boundary, convergent in this case, there is intense geological activity. Magma manages to rise through the cracks and gaps, and it forms volcanoes, creating a continental volcanic arc. Also, there are lot of earthquakes at such boundaries, as there is constant adjustment of the crust.
Such boundaries can be found between the:
- Pacific and North American plates
- Pacific and Eurasian plates
- Pacific and Australian plates
- Pacific and Philippine plates
- Nazca and South American plates
- Cocos and North American plate
Learn more about convergent plate boundaries brainly.com/question/12698571
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