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3 years ago

Which phrase describes non-foliated rocks?

Biology

1 answer:

larisa [96]3 years ago

8 0

Answer:

have randomly arranged grains

include quartzite and marble

form from crystallized magma

Explanation:

Metamorphic rocks are those rocks that are modified by heat, pressure and chemical processes, that occurred on the rocks that are buried deep below the earth crust. The exposure of the rocks developing under the earth crust gets altered on the basis of the mineralogy, chemical composition of the rocks and the texture of the rocks.

The non- foliated rocks are type of metamorphic rocks, which are formed by the igenous intrusions. The minerals inside these rocks are formed by the crystallization of the magma, the atoms in these rocks are tightly packed, the external structure of the rocks do not show any kind of layering or band appearance. Therefore, the rocks exhibit randomly packed grains.

The examples of these rocks are hornfels, quartzite, marble and novaculite.

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If the half-life of a radioactive atom is 3,500 years. How old is the substance if the parent-daughter ratio is 1:127?

balu736 [363]

Answer:

2.447 × 10⁴ years

Explanation:

Step 1: Given data

Half-life of the radioactive atom (t1/2): 3,500 years

Parent-daughter ratio ([A]/[A]₀): 1:127 (1/127)

Step 2: Calculate the rate constant

Radioactive decay follows first-order kinetics. We can calculate the rate constant (k) using the following equation.

k = ln2 / (t1/2) = ln2 / 3,500 y = 1.980 × 10⁻⁴ y⁻¹

Step 3: Calculate the time elapsed (t)

For first-order kinetics, we will use the following expression.

ln ([A]/[A]₀) = -k × t

t = ln ([A]/[A]₀)/ (-k)

t = ln (1/127) / (1.980 × 10⁻⁴ y⁻¹) = 2.447 × 10⁴ y

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3 years ago

What do you call a trait caused by a gene located on the X chromosome?

Morgarella [4.7K]

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Answer:

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Answer:

Explanation:

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