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evablogger [386]
4 years ago
11

Need help ASAP and pls hurry bc if you do i will give ten pts+brainliest

Geography
2 answers:
Sliva [168]4 years ago
7 0

Answer:

1. Without a calendar we could not know when to celebrate any of the festivals on particular days. We would even get the days of the week confused after a while. We would not be able to tell when a year had gone by, so it would be hard to keep track of someone's age.

2. Without numbers we wouldn't be able to count or measure anything. We would forget our age one day, and possibly forget how to count. Also we wouldn't be able to tell time, unless we used the sun. It would make life very problematic.

3. It would take very long to get us somewhere. We could no longer travel with airplanes, since they use wheels to take off. Such a simple thing as going to the grocery store, would turn into a huge task. Traveling would take very long to do, or might be non-existent if we didn't use horses.

Crank4 years ago
7 0

Answer:

i agree

Explanation:

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Which type of rock is shown in each of these photographs?
Aleks [24]

Answer:

i think it's metamorphic but im not completely sure

4 0
3 years ago
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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
4 years ago
How to answer these geography questions
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Where do most Africans live
LenaWriter [7]

Answer:

Nigeria

Explanation:

population of : 183,523,432.

More than south Africa.

4 0
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The correct answer is - Caribbean Sea.

Honduras is a country that belongs into the Central America region, with an excellent position by being a country that has access to two large bodies of water. From its eastern side, is located the Caribbean Sea, and in this sea is located the the biggest island of this region, the island nation of Cuba.

Honduras and Cuba are pretty close to each other, and the countries have traditionally good relations and collaboration, which is continuing to this day.

Both countries can be classified as Latino countries, as the dominant language and culture in them is the Spanish one.

4 0
3 years ago
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