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A relative age of the rocks of the earth's crust can be determined by using the laws of what?
Wiki User
∙ 11y ago
There are three laws of science that scientists use to date the crust by studying the layers of rocks. These laws are called the Law of Original Horizontality, the Law of Superposition, and the Law of Faunal Succession.
Wiki User
∙ 9y ago
Wiki User
∙ 15y agoGeologists and paleontologists look for trace fossils, evidences of specific organisms that existed for a relatively short period of time and for which a time period of existence is known. A general time range can then be assigned to the age of the rock without laboratory testing.
Wiki User
∙ 11y ago-Superposition-if a rock is below, it must be older for it to have been formed under the younger rock.
-Included fragments-if a rock contains fragments of another rock, then it must be younger for it to have been given fragments while it was forming from a rock layer which had already been formed.
-Cross-cutting-if a rock is cut through, then it must be older than the rock cutting through for it to have been there in the first place to have been cut through
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What is the main type of rock in oceanic crust?
The crust is divided into two types: oceanic crust and continental crust. Oceanic crust, found under the ocean floor, is made of dense rocks such as basalt. It is about 7 kilometers (4 miles) thick. Continental crust, found under land masses, is made of less dense rocks such as granite.
What is relitave dating?
relative dating is when you give an estimate date.
Define the composition parts of the earth?
The earth is composed of three layers. The crust of the earth contains the oceans and land, the mantle which is composed of rocks and precious metals, and the core that is made out of solid iron.
How does paleomagnetism provide support for the idea of sea floor spreading?
Rocks that are found at on the sea floor of the Earth differ in magnetizations. Using paleomagnetism, these rocks were known to have preserved an imprint of the changes in the earths magnetism over long periods of geological time, which proved the theory of sea floor spreading.
If you found a rock with seashells in it would it be a sedimentary rock an igneous rock or a metamorphic rock?
It is definitely a sedimentary rock because you cannot find sea shells where metamorphic rocks are formed, nor can you find them in magma and lava. This is because metamorphic rocks are formed below the earths surface where the plates of the earth squash an existing rock even small to make it metamorphic, and igneous rocks are obviously formed in volcanoes where the heat and pressure would melt the fossil.
A relative age of the rocks of the earths crust can be determined by using the laws of?
superposition a&c- Jackie
How is earths geolgic history determined?
it is determined by studying the relative and absolute ages of rocks and fossils
What is the earths under crust surrounded by?
Earths under crust surrounded by Upper Mantle (35-60 km) .The mantle is composed of sillicate rocks that are rich in iron and magnesium relative to the overlying crust.
What are the rocks that make up the earths crust?
the crust and the core
What is the earhs crust made of?
the earths crust is made out of rocks
What does rocks in earths mantle contain a higher percentage of what than rocks in earths crust?
iron and magnesium
What materials are the earths crust made of?
it is made of rocks
Where do metomorphic rocks form?
metamorphic rocks are formed in earths crust not on the surface
What is the difference between relative ages of and relative position of rocks?
Age is how old the rock is relative to other rocks, position is where the rock is in relation to other rocks. Tectonic motion and other forces can easily turn a portion of the Earths crust upside down resulting in older rock lying above younger layers.
What are two rocks that can be found in the earths crust?
Basalt and limestone.
What exists on earths crust?
crief boy quez
What makes close to 95 percent of the rocks of earths crust?
Silicates make up close to 95 percent of the rocks in the Earth's crust
