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melisa1 [442]
3 years ago
11

Why does the dark half of the moon always face away from the sun?

Geography
1 answer:
Alex787 [66]3 years ago
7 0

Answer:

because the light doesn't hit that side of the moon :)

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Which changes to the earth can be explained by plate tectonics?(Can be multiple answers) soil erosion, mountain chains, chemical
Akimi4 [234]

Answer:

mountain chains, earthquakes, volcanoes.

8 0
3 years ago
What is the country that is made up of thousands of islands near the equator?
tekilochka [14]
A. Indonesia.

 the Federated States of Micronesia and the Indonesia (both of which consist of thousands of islands). Others consist of a single island, such as Nauru, or part of an island, such as Haiti. 
8 0
3 years ago
Analysis of a rock sample that it contains 6.25% of its original uranium-235. How old is the rock? How do you know?
Andrews [41]

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!!!

7 0
3 years ago
A metamorphic rock can also be thought of as a rock that changes. What causes the rock to change?Layers of sediment build up ove
marissa [1.9K]

Answer: Extreme heat and pressure from deep within Earth cause changes to the rocks appearance, structure, and composition.

Explanation:

Remember!

- Sedimentary rocks are types of rock that are formed by the accumulation or deposition of small particles/sediments.

- Igneous rock is formed through the cooling and solidification of magma or lava

- Metamorphic rocks are changed by heat and pressure

6 0
3 years ago
Helppp
Gnesinka [82]

Answer:

In a <u>u</u><u>n</u><u>i</u><u>t</u><u>a</u><u>r</u><u>y</u> state, smaller member states agree to participate in forming a larger state.

6 0
3 years ago
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