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AVprozaik [17]
3 years ago
9

The Paleozoic Era ended with a mass extinction event that was likely caused by Choose one: A. the evolution of land plants. B. t

he formation of high-latitude ice sheets. C. the formation of Pangaea. D. intense volcanic activity.
Geography
1 answer:
Zarrin [17]3 years ago
4 0

Answer:

D. intense volcanic activity.

Explanation:

  • The Paleozoic era an era in the geologic time and started about 541 million years. It originated due to the diversity of life forms on the planet.  and ended about 252 mn years ago along with the end of Permian era.
  • The extinction was related to the changes in climate and  exceptionally low sea levels. During which about 95% of the marine species were killed.
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The technique called radiometric dating is based on
Dima020 [189]

Answer:

D) the steady, clocklike decay of certain radioactive isotopes over time.

Explanation:

Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks.

For example, when rocks are formed, such as igneous rocks (formed when molten rocks cools), certain radioactive atoms are trapped inside the rocks during this formation process. Then these radioactive atoms decay over time.

The age of the rock can be estimated by comparing the occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.

From the options;

A) this is about the formation of the radioactive molecules and not about radiometric dating

B) this is radiocarbon dating (cabon dating/carbon-14 dating)

C) the <em>assumption </em>is wrong since the radioactive isotopes decays not accumulate.

D) the corect option as I explained earlier.

3 0
4 years ago
What are popular navigation systems ?
Delicious77 [7]
GPS, Glonass are the most popular
5 0
3 years ago
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Which countries' boundaries changed as a result of World War I or World War II?
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I think what is soviet union or germany
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3 years ago
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Distinguish "peri-urbanization" from "urbanization"
Gala2k [10]

Urban areas are characterized by high population density when compared to other areas

Areas that are located on the outskirts of cities or large urban areas but retain rural characteristics such as agricultural productions are generally considered as peri urban areas

3 0
3 years ago
No Paraná existem atualmente três etnias indígenas:___________, ___________ e ____________. Elas vivem, em sua maioria, nas 17 t
Viefleur [7K]

Answer:

A opção B está correta.

Guarani, Kaingang e Xetá.

No Paraná existem atualmente três etnias indígenas: Guarani, Kaingang e Xetá. Elas vivem, em sua maioria, nas 17 terras indígenas demarcadas pelo governo federal, onde recebem assistência médica, odontológica e educação diferenciada bilíngue.

Explanation:

Pergunta Completa

No Paraná existem atualmente três etnias indígenas:___________, ___________ e ____________. Elas vivem, em sua maioria, nas 17 terras indígenas demarcadas pelo governo federal, onde recebem assistência médica, odontológica e educação diferenciada bilíngue.

a) Guarani, Pataxó e Potiguara.

b) Guarani, Kaingang e Xetá.

c) Ticuna, Guarani e Makushi

d) Terena, Guajajara e Xavante

O Paraná é um dos 26 estados do Brasil. É um estado no sul do Brasil e compartilha fronteiras com a Argentina. É popular por abrigar 3 das tribos indígenas populares no Brasil, incluindo Guarani, Kaingang e Xetá.

Espero que isto ajude!!!

6 0
3 years ago
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