Astronomers estimate that the runoff channels seen on Mars must be at least 3.9 billion years old. How do they estimate ages like this? a. by examining radioactive rocks from these channels returned to Earth by robot probes b. by counting impact craters in the regions containing these channels c. by looking for the erosion of these channels by the regular periods of rainfall that occur on Mars even today d. by measuring the height of the region in which the channels occur; on Mars, older regions are always lower in elevation e. guessing

Answers

Answer 1

Answer:  b. by counting impact craters in the regions containing these channels

Explanation:

In counting the impact craters in the areas containing the runoff channels in question, scientists are able to infer the ages of these channels.

The logic is simple, the longer these areas have been exposed, the more meteors they would have been hit by to create these craters. Therefore areas with more craters must have been around for longer and using mathematical models, they come up with age estimates.


Related Questions

List some changes that humans are responsible for that can cause an area of Earth to change (and therefore cause the satellite images to change over time).

Answers

Polluting the earth with garbage

And too many greenhouse layers can harm the ozone layer.

autism

When you think of a hero, which qualities come to
mind? Select all that apply.
shows extraordinary bravery
helps others in times of need
puts the needs of others first
can be trusted to do the right thing
is caring and kind

Answers

Answer:

shows extraordinary bravery

helps others in times of need

Explanation:

Answer:

Why did you look this up, its an opinion question, any awnser is right

Explanation:

please answer quickly.

Answers

Answer:

Puritans

Explanation:

Find the probability of getting
square number when a fair dice is thrown.​

Answers

Answer:

four is the only square number on a fair dice

therefore, 4/6 = 2/3

this is the correct answer

There is only one square number in a dice which is four.
The answer will NOT be 4/6 because it means there are four possibilities .
The answer is 1/6 as it means out of six there is only one possibility

Which North African has most of its population in only 3% of its land area

Answers

Answer:

The largest country in land area is Algeria at 2,381,740 km2.

Explanation:

This is one country, with 41,657,488 people

Algeria country was in North Africa and has most of its population in only 3% of its land area from the population.

What is population?

Population information is characterized as a bunch of people who share a trademark or set of these. Population assists us with getting a gauge of the number of creatures and acceptable behavior in like manner.

the Algerian population lives along the Mediterranean coast on 12% of the nation's complete body of land. Algeria is an enormous country in western North Africa, with a shore on the Mediterranean Ocean toward the north.

It faces numerous monetary difficulties, including high joblessness for ladies and youth and imbalance among its various districts. There will be around  41,657,488 people in the country.

Learn more about population, here:

https://brainly.com/question/27991860

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how did belgian approach colonization

Answers

Answer:

King Leopold II of Belgium tried to persuade the Belgian government to support colonial expansion around Congo Basin. Leopold established a colony himself.

Explanation:

Belgium controlled 3 colonies and 3 concessions during its history. Belgian Congo, (1908/1960) Ruanda Urundi, (1923/1962) and a concession in China.

(I hope this helps! Have a great day!)

What are some differences between Igneous and Metamorphic rocks?

Answers

Answer:

The main difference is that the Crystals in an igneous rock is shaped as it crystallized from a melt. The structure in a Metamorphic are earlier structures (Crystal, sedimentary fragments, etc ) that have been deformed or recrystallized due to heat or pressure or some chemical change.

Answer:

Igneous Rocks:-

1. Igneous rocks are formed when magma (or molten rocks) have cooled down and solidified.

2. Igneous rocks are commonly found inside the Earth’s crust or mantle.

3. The texture of igneous rocks depends on how fast it has cooled down. Textures range from coarse-grained to glassy.

4. They mainly have a crystal-like structure.

5. Igneous rocks are of two types – intrusive (solidified from magma below the earth’s surface) and extrusive (solidified from lava on the surface of the earth).

6. Examples:- Intrusive igneous rocks include – granite, diorite, pegmatite; Extrusive igneous rocks include – basalt, tuff, pumice, scoria, etc.

Metamorphic rocks:-

1. Metamorphic rocks are formed when other pre-existing rocks go through chemical and physical changes and form due to intense heat or pressure.

2. Metamorphic rocks are found on the Earth’s surface.

3. The texture of metamorphic rocks is foliated due to pressure. Some rocks may even appear to be non-foliated and banded.

4. They are very hard and may appear to be banded or layered.

5. Metamorphic rocks can be divided into two basic categories – foliated metamorphic rocks and non-foliated metamorphic rocks.

6. Examples:- Slate, marble, quartzite, phyllite, gneiss, hornfels, etc.

Which statement best summarizes the information in
the paragraph?
O Earthquakes may occur at all types of plate
boundaries.
O The strength of an earthquake depends on the type
of boundary.
O All earthquakes at plate boundaries result from
forces underneath Earth's surface or volcanic
eruptions.
Different types of plate interactions result in
earthquakes of varying strengths at various depths.

Answers

The statement that best summarizes the information given in the paragraph is that different types of plate interactions result in earthquakes of varying strengths at varying depths. Hence, option D is correct.

What is an earthquake?

A naturally occurring disaster, which is caused due to an imbalance in the movement and vibrations of the tectonic plates of the Earth, is known as an earthquake.

The degree of an earthquake is driven by a number of factors, one of which is the interactions of the plates differently. These interactions determine the strength and depth of an earthquake.

Hence, option D holds true regarding an earthquake. The complete question has been attached as an image for better reference.

Learn more about an earthquake here:

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Answer: D

Explanation: Different types of plate interactions result in earthquakes of varying strengths at various depths.

+ What would happen if the earth rotates in an opposite
direction?​

Answers

Answer:

I believe that everything would just be the opposite of what it is now.

Explanation:

Like, seasons would flip (Possibly change positions on the planet), months would also flip, uh, yeah.

Identify at least three rivers and their location in Asia.

Answers

Answer:

below

Explanation:

1. Yangtze river (longest river in asia!)

- Eastern China

2. Ganges river

- India and Bangladesh

3. Han river

- South Korea

explain 5 significance of rocks​

Answers

Rock that forms the earth's masonization also serves as a barrier to avalanches.

autism

4. A ladder leaning against a wall makes an angle of 75º with the ground. If the ladder
measures 23.2 feet long, how far is the foot of the ladder from the base of the wall?

Answers

Answer:

6 feet

Explanation:

What are some differences between Igneous and Metamorphic rocks?

Answers

Answer:

Igneous rock , formed by the cooling of magma inside the Earth or on the surface.

Metamorphic rocks, formed by temperature and pressure changes inside the Earth.

Explanation:

Igneous and Metamorphic are formed in different ways,

Metamorphic rocks: arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock may be a sedimentary rock, an igneous rock or another older metamorphic rock.

Igneous rocks: began as magma (molten rock) which cooled and crystallized into minerals. This magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.

Credit: http://www.geologyin.com/2016/06/top-7-differences-between-metamorphic.html

Spiral galaxies are ________ and elliptical galaxies are _________.
A. Spinning -- Growing
B. Expanding -- Spinning
C. Condensing -- Growing
D. Spinning -- Condensing

Answers

B I took the test and got it right
Spiral galaxies are ________ and elliptical galaxies are _________.
A. Spinning -- Growing
B. Expanding -- Spinning
C. Condensing -- Growing
D. Spinning -- Condensing

are artesian springs natural?

Answers

Yes , they are also very clean

What stratigies can you use to reduce your electricity bill? How much money could you save?If possible, discuss your ideas with you classmates.

Answers

Answer:

A simple thing you can do is use less electricity. For example, people use electricity for light a lot and they can reduce that by just not using it in certain times like in the day time, they can open their windows for sun light and turn the lights on in night time. People also use too much electricity on gadgets and electronics and they can reduce that by just not charging them too often and using them a bit less. By doing these methods you can maybe save around 10$ to 100$ or even more.

'The atmospheric impact of global warming depends on latitude.'With the aid of examples, how far do you agree?

Please help I need a really long answer. About a page's worth of writing

Answers

Answer:

latitude is one of the factor to determine the climate .when latitude increases from the equilateral line temperature decreases and at the polar temperature will be less temperature varies .like africa lies near or in equilateral zone so temperature is high but north and south pole it is cold .so atmospheric condition is high at equilateral zone but low in polar zone. 'The atmospheric impact of global warming depends on latitude.'

Answer:

Latitude affects the temperature of a place. The places situated at higher altitudes which are far from equator receive less sunlight and places which are located towards the equator which is a 00 latitude receives more sunlight and are hotter than the places located at higher latitudes.

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