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Is volcanic rock older than sedimentary rock?
Not necessarily. There are volcanic rocks that date back to the precambrian time, much older than most sedimentary rocks around today. At the same time, as there is still continuous volcanic activity on earth, some volcanic rocks may be only minutes old, making them the youngest rocks on earth.
How can rocks tell us about the history of the earth?
Rocks tell the story of the Earth. The Earth is made of rock, from the tallest mountains to the floor of the deepest ocean. Thousands of different types of rocks and minerals have been found on Earth. Most rocks at the Earth's surface are formed from only eight elements (oxygen, silicon, aluminum, iron, magnesium, calcium, potassium, and sodium), but these elements are combined in a number of ways to make rocks that are very different. Rocks are continually changing. Wind and water wear them down and carry bits of rock away; the tiny particles accumulate in a lake or ocean and harden into rock again. The oldest rock that has ever been found is more than 3.9 billion years old. The Earth itself is at least 4.5 billion years old, but rocks from the beginning of Earth's history have changed so much from their original form that they have become new kinds of rock. By studying how rocks form and change, scientists have built a solid understanding of the Earth we live on and its long history.
How much money would you get by selling an igneous rock?
Probably not very much, igneous rocks are caused through the cooling of magma or larva and are very common on earth. Granite and Basalt are examples of igneous rocks.
How fossil form in rock?
Fossils in rocks are pretty much like clay.
Why do fold mountains have metamorphic rocks?
Most mountains are metamorphic due to the environment they are formed. The folding occurs deep below the surface where the rocks are only partially melted, and under increasing pressures and temperatures. This causes the rocks to bend (fold) and recrystallize into metamorphic versions of the origin rocks.
Where does much of your history of Precambrian rocks come from?
Ores mined from shields...
How much of earths history took place during the Precambrian Eon?
4 billon years i think
Is volcanic rock older than sedimentary rock?
Not necessarily. There are volcanic rocks that date back to the precambrian time, much older than most sedimentary rocks around today. At the same time, as there is still continuous volcanic activity on earth, some volcanic rocks may be only minutes old, making them the youngest rocks on earth.
What does rocks have to do with geology?
Geology is the study of the earth. Since much of the earth is made up of rocks, most geologists spend time studying how the rocks change over time, along with their history and formation.
What have scientist inferred from fossil stromatolites?
Stromatolites were much more abundant on the planet in Precambrian times which means that fossils found around stromatolites are typically from the Precambrian era.
Where does asteroid come from?
Asteroids are small fractions of much larger stars, planets, and rocks in space.
Much of what scientists know about the moon has come from?
studying moon rocks gathered by astronauts ;D
Why is little known about much of Earth's early history?
Many Precambrian rocks have gone through the rock cycle and been altered or transformed because of the number of years that have passed (over half a billion), and because of the vastness of the ancient time span (over 4 billion years).
How much of the earths history does the pre-Cambrian era account for?
The Precambrian Super-Eon lasted from Earths creation 4.54 billion years ago until the Cambrian Period 542 million years ago. Some 3.998 billion years. This accounts for about 88% of Earth's history.
According to the precambrian rock record much of earth's first free oxygen combined with what?
Iron
What is meant by term Cambrian explosion?
The Cambrian explosion is an apparently sudden increase in fossils marking the separation between Precambrian rocks and Cambrian rocks. At one time this was believed to mark the beginning of multicellular life, but in fact it only marks the evolution of hard body parts (most of which were made of calcium carbonate). It turns out that there were as many multicellular organisms in the late Precambrian as there were during the Cambrian explosion at the beginning of the Cambrian, but the lack of hard body parts in those organisms made the formation of easy to identify fossils of those organisms much rarer.
Why hasn't cyanobacteria evolved much since the Precambrian Era?
There are many different types of cyanobacteria. We are just now beginning to discover how many exist in a drop of seawater. We have no idea how many existed in the Precambrian era.
