"The History of the Earth" The Earth in the Universe PPT

"The History of the Earth" The Earth in the Universe PPT

Part 1: How to study the history of the Earth?

strata

Strata are layers of rocks and accumulations formed during a certain era in geological history.

The strata formed in different ages contain a variety of information such as climate and hydrology in different periods, as well as fossils of various animals and plants, which can reflect the history of the earth.

1. The strata of sedimentary rocks have obvious bedding structures. Generally, those deposited first are on the bottom and those deposited later are on top.

2. Strata formed in the same era often contain the same or similar fossils.

3. The older the stratum, the simpler and lower-level the biological fossils it contains.

The history of the earth PPT, part 2: content analysis

Precambrian period: from the birth of the earth to 541 million years ago

It belongs to the Cryptozoic Era, including the Hadean Eon, the Archaean Eon, and the Proterozoic Eon, with a time span of about 4 billion years and accounting for about 90% of the earth's history.

When the earth was formed, the main components of the atmosphere were carbon dioxide, carbon monoxide, methane and ammonia, and lacked oxygen.

Hades: Only organic matter, no life.

Archean Eon: Prokaryotes such as cyanobacteria appeared and produced oxygen through photosynthesis.

Proterozoic Eon: Cyanobacteria exploded, the composition of the atmosphere began to change, and organisms further evolved into eukaryotic and multicellular organisms.

Metal mineral mineralization period.

Paleozoic Era: 541-252 million years ago

Early Paleozoic

Entering the Phanerozoic, the Early Paleozoic includes the Cambrian, Ordovician, and Silurian periods, with a time span of about 122 million years.

The Early Paleozoic Era was a world of marine invertebrates.

At this time, the area of ​​the earth's oceans was much larger than it is now, and creatures such as trilobites, graptolites, and nautiluses appeared.

Late Paleozoic

The Late Paleozoic Era includes the Devonian, Carboniferous, and Permian periods, with a time span of about 167 million years.

The Late Paleozoic was the world of vertebrate fish and amphibians.

In the early days, fish multiplied in large numbers, and as the ocean area decreased, some fish evolved into amphibians.

Gymnosperms began to appear and ferns flourished. This was an important coal-forming period in geological history.

The crustal movement in the Paleozoic was active, forming a combined ancient continent.

Mesozoic Era: 252 million to 66 million years ago

Mesozoic Era

The Mesozoic Era includes the Triassic, Jurassic, and Cretaceous periods, meaning the "intermediate era of life."

The Mesozoic era was the world of reptiles, and the representative animals were dinosaurs.

In addition, some reptiles evolved feathers and began to develop into birds, and some mammals also began to appear.

Gymnosperms flourished, and together with the Paleozoic Era, it was an important coal-forming period in geological history.

United Ancient Continent began to break up in the late Triassic, and the continents began to drift.

The history of the earth PPT, the third part: important mineralization period

The Paleoproterozoic was the first very important mineralization period in geological history. It is famous for its many types of minerals, large scale, and complex types of mineral deposits. For example, at this stage in China, there were a large number of minerals produced due to the dispersion and orogeny of ancient continents, forming mineralization belts of iron, copper, lead-zinc, gold, boron, magnesite, talc and other deposits.

Both the late Paleozoic and the Mesozoic were important coal-forming periods. Ferns flourished in the late Paleozoic and gymnosperms flourished in the Mesozoic.

History of the Earth PPT, Part 4: Evolutionary Characteristics

Ferns, which appeared in the Devonian period, mostly grow in dark and moist corners and reproduce with spores.

Gymnosperms have no peel and the seeds are exposed, such as Ginkgo biloba.

Angiosperms, also called flowering plants, are green flowering plants and are the most advanced type of plants.

History of the Earth PPT, Part 5: In-class Training

1. The period when a large number of invertebrates appeared on the surface of the earth ( )

A.Proterozoic Era B.Archaean Era

C.Paleozoic Era Cambrian D.Mesozoic Era Jurassic

2. Which of the following statements about the stages of biological development is correct ( )

A. Fish appeared in the Cambrian period of the Paleozoic era B. Dinosaurs flourished in the Jurassic period of the Mesozoic era

C. Mammals appeared in the Quaternary of the Cenozoic Era. D. Forest ecosystems appeared in the early Paleozoic Era.

3. Primitive fish appear in ( )

A. Proterozoic Era B. Middle Paleozoic Era

C. Late Paleozoic Era D. Middle Mesozoic Era

4. The formation containing trilobite fossils is ( )

A.Paleozoic strata B.Proterozoic strata

C. Mesozoic strata D. Cenozoic strata

Earth's History PPT, Part Six: Why is the Cambrian the beginning of the Phanerozoic?

When scientists studied ancient strata, they found that 541 million years ago, the fossils buried in the strata were mainly algae fossils and trace fossils left by molluscs. The life forms were very simple. Since then, the number and types of animal fossils have increased. There has been an explosive growth, and a large number of animal fossils with hard shells or bones have appeared, and biological structures have also shown an increasingly complex trend.

Therefore, scientists regard the emergence of a large number of hard-bodied organisms as a symbol of dividing a new geological era, and name this geological era the Cambrian. The Cambrian also represents a new period when a large number of organisms begin to appear on the earth. The eon began, and the long period before that was collectively called the Precambrian due to the scarcity of life on Earth.

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