Answer:
The movements of the tectonic plates created Lake Chad.
Explanation:
No, the desertification is not a problem only where there is an existing desert.
Explanation:
The desertification is a process through which an area gradually transforms into a desert. This process can happen because of multiple factors, roughly being divided into two groups; anthropogene and natural. The desertification mostly appears in areas that border the deserts, but it also appears on places that are far away and have no contact with any deserts.
Naturally, the desertification occurs because of changes in the climate, so if the climate becomes drier and warmer, the deserts will start expending. The problem is that the humans actually started to be the main factor leading to desertification with their activities. Very often, the humans are not responsible towards the environment, and they destroy the vegetation, the soils, which in turn causes large scale erosion and local climate changes, and an area becomes a desert very quickly.
There has been efforts in the past few decades to stop the desertification and even reverse it. Most noticeably, it has been China that has had the biggest success in this, managing to turn millions of hectares into green areas. Also, the countries of the Sahel region have come together to make a green wall between the desert and the savanna, and the results have been very positive.
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Ecuador is the largest exporter of bananas
Answer:
Paleozoic era
Explanation:
The Paleozoic era refers to the time period ranging from 540 million years back to 250 million years back. It is comprised of six distinct periods, namely Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. During this era, a large number of species evolved after the huge Cambrian explosion. The environmental changes that occurred during that time favored the growth of numerous species, and species have undergone radiative adaption.
This era was characterized by the presence of Trilobites that were abundant in the Cambrian. The Crinoids were closely related to the sea urchins and starfishes and are important fossils. Brachiopods were also dominant during this time. Some of them are still found such as the Lingula, which is a living fossil.
These species covered a large geographical extent in the ocean water bodies and were extinct in the huge mass extinction event that took place on earth by the end of Permian.