Answer:
The age of the rock = 2800.6 million years = 2.8 billion years.
A simple method of analysis similar to Carbon dating is used to obtain the required age of the rock. Radioactive substances decay according to first order reaction kinetics. So, plugging all the required parameters into the general equation for amount of substance left in a first order decay gives us the age of the rock.
Explanation:
Half life of Uranium-235 = 700 million years (from literature)
The decay of radioactive substances follow first order reaction kinetics.
The general equation is given as
A(t) = A₀ e⁻ᵏᵗ
A(t) = Amount of radioactive substance left after a particular time = 6.25%
A₀ = initial amount of radioactive substance = 100%
t = time that has passed since the beginning = age of the rock = ?
k = decay constant
The decay constant is related to the half life (T) through the relation,
k = (In 2)/T
k = (0.693/700) = 0.00099 /million years
A(t) = A₀ e⁻ᵏᵗ
6.25 = 100 e⁻ᵏᵗ
0.0625 = e⁻ᵏᵗ
In e⁻ᵏᵗ = In 0.0625 = -2.7726
-kt = - 2.7726
t = (2.7726/0.00099) = 2800.6 million years
t = 2.8 billion years.
Hope this Helps!!!
Explanation:
Intrusive igneous rocks cool from magma slowly because they are buried beneath the surface, so they have large crystals. Extrusive igneous rocks cool from lava rapidly because they form at the surface, so they have small crystals.
Answer:
A.
Explanation:
Shale is a sedimentary rock that is often associated with oil deposits. This is due in part to the tiny and very fine grains that make up shale. As the sediments are compacted, organic matter is trapped by the particles of clay and silt.
Later, as sedimentation continues and the layers are buried farther underground, the heat and pressure convert some of the organic material into oil. While much of the gas escapes the porous shales, some also remains trapped in the rock layer.
Question is incomplete. (Choices were missing)
<u>Complete question:</u>
In addition to certain types of minerals, Curiosity was designed to find a certain class of materials in the rocks. Although not necessarily an indicator of life itself, what type of materials that are important for life (or could even be the products of life) is Curiosity equipped to find in the rocks?
Group of answer choices
1.Organic materials
2.Cryptocrystalline materials
3.Inorganic materials
4.Superconducting materials
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<u>Answer:</u>
Organic material
<u>Explanation:</u>
Organic material consist of a whole series of product which ranges from the undecomposed plant and animal tissues. It basically refers to material which has hydrogen -carbon bonds as essential structures. As we all know Carbon is the element which is fundamental to life.
Organic material is basically a reservoir of nutrients that can be released in the soil.
Apart from this certain other elements such as:
- Hydrogen
- nitrogen
- Sulphur etc
are also needed to produce organic material. So if such materials are found, they potentially indicate towards life.
Hence, the correct answer is organic material.
The second one is most likely to be right
