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The first era is the Precambrian Era. During this time, which makes up 85% of the earth's existence, life was not common, partly because there was a lack of an environment that creatures could survive in. Early life consisted of single celled organisms and, possibly, viruses. These early cells likely got their energy from chemicals produced in the earth - not from the sun's energy. Unlike todays life, which mostly uses oxygen to survive, early organisms found oxygen to be a poison.
Possibly as early as 2.5 billion years ago, an organism arose which used the sun's energy in a process called photosynthesis. This organism, called cyanobacteria (also called blue-green algae) excreted oxygen in the process and this changed the living planet as oxygen levels rose and killed off many other ancient organisms.
Evidence of this early life comes in the form of stromatolites, which are rocky mounds which the cyanobacteria created on the ocean floor. Stromatolites are still being created by cyanobacteria, in the oceans and in hypersaline lakes. There is evidence of other organisms grazing on stromatolites as early as 1 billion years ago, which means that these more complex organisms had already evolved.
What else can I help you with?
Do metals only come fron ores?
Yes, metals do only come from ores and pure metals also are found in the Earth's crust.
Why are igneous rocks useful?
Igneous rocks are important to science because scientist need to know about all the different types of things in our world today. The reason also because igneous rocks come from volvanoe and the stuff that comes out of a volcanoe is called LAVA /MAGma!
What type f rocks come from living things?
the type of rocks that don't come from living things is .
Do all the rocks come from the same place?
No. Rocks have a wide variety of origins.
What ions are in an ionic bond and who do they came from?
Positive and negative ions are in ionic bond. They come from metals and non-metals
Where does much of your history of Precambrian rocks come from?
Ores mined from shields...
Where do most of our history of precambrian rocks come from?
Most of our knowledge of Precambrian rocks comes from studying exposed rock outcrops on the Earth's surface, as well as from drilling deep boreholes and mining operations. Additionally, information about Precambrian rocks can be gleaned from geophysical surveys and satellite imagery.
A mineral with a valuable metal in it is an?
All metals come in a Raw form and are extracted from rocks that are called Ores
Where does much of our history of Precambrian rocks come from?
Much of our history of Precambrian rocks comes from geological studies that include analyzing rock formations, isotopic dating, and examining ancient mineral deposits. Additionally, the study of metamorphic and igneous processes, alongside the fossil record of stromatolites and microfossils, provides insights into early Earth conditions. Regions like Canada’s Shield, South Africa, and Australia contain well-preserved Precambrian strata that have been crucial for understanding this extensive period. These records help reconstruct the environmental and biological evolution of the Earth before the Cambrian explosion.
The earth is made mostly of metals and rocks Where did this material come from?
The materials that make up Earth, including metals and rocks, were formed during the process of planetary accretion from the solar nebula about 4.6 billion years ago. These materials condensed and accumulated to form the Earth as we know it today. Rocks are composed of various minerals, which are made up of elements like silicon, oxygen, aluminum, iron, and other metals that were present in the early solar system.
What objects come from rocks?
Various objects come from rocks, such as gemstones (like diamonds or rubies), building materials like marble or granite, metals like gold or iron, and salt. Rocks can also be used for landscaping, sculptures, and even in medicinal treatments like from minerals.
What makes transition metals useful in industry?
They come into useful things from metals come i to use
Do metals only come fron ores?
Yes, metals do only come from ores and pure metals also are found in the Earth's crust.
When rocks come into molten rocks?
igneous
What type of solid rock forms on a volcano from the lava during an eruption?
Igneous rocks are formed after solidification of lava (Magma inside earth). They are rich in metals as metals are found deep in earth and hence they come out in molten state with the lava.
What ions are in an ionic bond and who do they come from?
Cations and anions are in ionic bond. They come from metals and non-metals.
Where did the small grains of rocks come from?
Older rocks.
