please check my answers + help me improve them.
*
1.) explain why earth & other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago + what was this particular time period called & why is this time period not really considered a part of earth’s geological history?
*
2.) describe the 2 most important events in the history of animal life that occurred at the beginning & at the end of the paleozoic era + list and briefly outline the 6 different periods into which the paleozoic era is divided.
*
3.) describe how the triassic period was a transitional time period during the mesozoic era + explain why the boundary between the triassic & jurassic periods is similar to the boundary between the Permian & triassic periods.
*
4.) which era is sometimes referred to as the Age of Mammals + list the other possible names that could have been used to describe this era & why
*
Answers:
1.) Earth and other planets were not solid when they formed during the beginning of Precambrian times because the planet was 'just born', and was very hot, in fact molten was a cause of it not being solid. Aside from that, lots of volcanic activity was going on, and different 'bodies' collided. Even now the earth is not solid. A thin crust borders a molten mass of liquid rock, that is thousands of miles thick. This particular time period is known as the Hadean eon, and this time peiod is not really considered a part of earths geological history because we don't know much about it.
*
2.) The two most important events in the history of animal life that occurred at the beginning and at the end of the Paleozoic era is the dramatic increase in the diversity of multicelled animals, and that almost all marine animals (90%) became instinct.
1.) Permian: about 290 million years ago.
2.) Carboniferous: about 355 million years ago.
3.) Devonian: about 415 million years ago.
4.) Silurian: about 445 million years ago
5.) Ordovician: about 490 million years ago
6.) Cambrian: about 545 million years ago
*
3.) The triassic period was a transitional time period during the mesozoic era because of the transition that changed different periods through the era, like the jurassic period. The boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods because the global climate was not radically changed, even though an extinction of many terrestrial vertebrates happened.
*
4.) The era that is sometimes referred to as the age of mammals is the Cenozoic era. Other possible names that could have been used to desire this era is ice age, because of the growth in ice over the arctic during this time, or an organic age because of the growth of flowers and plants. Even an Organism age because of the life that was created through that time, such as the snakes, flowers, and mammals.
I change my 4.) to
The era that is sometimes referred to as the age of mammals is the Cenozoic era. Other possible names that could have been used to describe this era is the “Age of Flowering Plants” or the “Age of Insects” or the “Age of Teleost Fish” or the “Age of Birds”. It could be accurately named those because each of them were true diversities of life that happened in the Cenozoic era.
Perfect! :)
Perfect! :)
And on number 2 the last word, what do you mean?
You are correct, there are a couple of words you could replace, but you will get it correct ;)
Water cycle- no. B. Unending cycle of water. Evaporates, atmosphere, clouds, rains. Streams lakes, oceans and evaporates, a never ending cycle. They say every molecule of water on earth will go thru the cycle at least once, probably many times. So evaporation is kinda right too
1.) Your answer for the first question is mostly accurate. Earth and other planets were not solid when they formed during the beginning of the Precambrian due to the high temperatures and intense volcanic activity. The collisions of different celestial bodies also contributed to the formation process. The specific time period during the Precambrian that corresponds to Earth's formation is called the Hadean eon. This time period is not considered a part of Earth's geological history because it is difficult for scientists to gather detailed information about it. The lack of solid rock and extensive geological processes makes it challenging to study and analyze this early period.
2.) Your answer for the second question is partially correct. The two most important events in the history of animal life during the Paleozoic era are the Cambrian explosion, which marked a rapid increase in the diversity of multicellular animals, and the Permian-Triassic mass extinction, where approximately 90% of marine species became extinct.
Regarding the division of the Paleozoic era, there are actually six periods:
1) Cambrian: Spanning approximately 541 to 485 million years ago, it is known for the explosion of multicellular life and the development of various animal body plans.
2) Ordovician: Occurring around 485 to 444 million years ago, this period witnessed the diversification of marine life and the colonization of land by early plants.
3) Silurian: Lasting from about 444 to 419 million years ago, this period saw the evolution of jawed fishes and the first appearance of terrestrial arthropods.
4) Devonian: Taking place between 419 and 359 million years ago, this period is known for the diversification of fishes, the appearance of the first amphibians, and the emergence of forests.
5) Carboniferous: Spanning approximately 359 to 299 million years ago, this period is characterized by extensive coal-forming forests, the evolution of reptiles, and the rise of winged insects.
6) Permian: Occurring around 299 to 252 million years ago, this period witnessed the dominance of reptiles, the spread of seed plants, and ended with the Permian-Triassic mass extinction.
3.) Your answer for the third question is correct. The Triassic period acted as a transitional time period during the Mesozoic era, as there were significant changes in terrestrial vertebrate life and the rise of dinosaurs. The boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods in terms of the significant extinction events that occurred. Both boundaries mark major shifts in biodiversity due to mass extinctions caused by environmental changes.
4.) Your answer for the fourth question is accurate. The era that is sometimes referred to as the Age of Mammals is indeed the Cenozoic era. Other possible names that could have been used to describe this era include the Age of Ice, referring to the widespread glaciation events during this time, and the Age of Flowering Plants, highlighting the rapid evolution and dominance of flowering plants during this era. The term "Organism Age" is not commonly used to describe the Cenozoic era.
Overall, your answers are quite good, but there are some minor improvements and clarifications that could be made.