Question

Which large landmasses formed when Pangaea first started to separate? Check all that apply.

Africa
Europe
Gondwanaland
Laurasia
North America
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Which characteristics do Neptune and Uranus share? Check all that apply.
no rings
blue color
27 moons
no axis tilt
cold temperatures
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A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron.

Which action would be most important to perform in a controlled experiment?
Design an experiment that is based on previously published results.
Expose the treated iron to the corrosive effects of the air.
Test a large piece of treated iron and a small piece of untreated iron.
Test a piece of treated iron and a piece of untreated iron under the same conditions.
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Which planets have evidence of water on the surface? Check all that apply.
Earth
Mars
Mercury
Neptune
Saturn
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What do scientists know about the future of the universe? Check all that apply.
that dark matter exists
what dark matter is made of
why the expansion of the universe is accelerating
that invisible matter must be influencing the rotation of galaxies
that galaxies spin faster than they should based on visible matter
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Which statements describe Earth? Check all that apply.
It is an outer planet.
It is a terrestrial planet.
It was formed from gas and dust.
It has a thick atmosphere of hydrogen and helium.
It was formed in a debris disk from colliding planetesimals.
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Why are forecasters able to make more accurate predictions about the weather when using electronic tools?
A wide variety of devices can be used to collect weather data from many places.
Weather data come exclusively from different weather stations in one region.
Data fed into a supercomputer accounts only for select processes that occur on Earth.
Scientists must input several pieces of weather information into a computer system.
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Which statements describe what is gained or lost during radioactive decay? Check all that apply.
Atoms gain other atoms.
Elements take in energy.
Atoms lose smaller particles.
Elements gain smaller particles.
Energy and particles are released.
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Answer 1

Answer to Q1:

• Gondwanaland
• Laurasia

Explanation:

The name Pangaea, or Pangea, borrows from Greek, meaning "all earth". During the Triassic period about 200 million years ago, the land mass in which Pangaea was divided into two major land masses were Laurasia and Gondwanaland. So they are the correct choices

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Answer to Q2:

• blue color
• cold temperatures

Explanation:

The atmosphere of Uranus and Neptune have methane gas inside it so that is the reason why they are blue in color and the reason behind the cold temperature is that both of these planets have some Thick, slushy mantle of water, ammonia & methane ices which lowers the temperature of these planets resulting in cold temperature.

Answer to Q3:

Expose the treated iron to the corrosive effects of the air.

Explanation:

Rust is actually dependent upon aerial oxygen When oxygen present in the air reacts with the piece of iron there we get rust. So if the scientist want to see the effects of rust in a controlled experiment he must take air into account.

Answer to Q4:

The following planets have evidence of water on the surface

• Earth
• Mars

Explanation:

Earth is the only plant where water exist in liquid form on its surface openly and about 70% of the whole earth surface is covered with water. Similarly, in 2015, NASA confirmed that liquid water flows intermittently on present-day Mars but it is not shown on the surface yet.

Answer to Q5:

The correct options are

• why the expansion of the universe is accelerating
• that galaxies spin faster than they should based on visible matter

Explanation:

Astronomers believe that the faster expansion rate of galaxies is because of a mysterious and dark force that is pulling galaxies apart. That dark force or energy is still unknown but one explanation for this dark energy is that it is a property of space and it exists surprisingly in the universe.

If we talk about the speed of the galaxies keeping the matter in account then these galaxies move faster as they seems to be because of the large amount of dark matter in nearby galaxies (including the Milky Way.

Answer to Q6:

The following statements describe Earth

• It is a terrestrial planet.
• It was formed from gas and dust.

Step-by-step explanation:

A terrestrial planet is a rocky planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are Mercury, Venus, Earth, and Mars which are the inner planets closest to the Sun. For the second part approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. ... In this way, asteroids, comets, planets and moons were created so we can say that earth was formed from gas and dust too.

Answer to Q7:

Forecasters able to make more accurate predictions about the weather when using electronic tools because A wide variety of devices can be used to collect weather data from many places.

Explanation:

Weather information can be deduced from electronic devices and the data is simultaneously sent and received by earth from the earth stations which are connected to a satellite network. Since there are many devices and many satellites at the same time and all of them work on electronic components so that is why the accuracy in weather forecasting is more reliable.

Answer to Q8:

The following choices are correct

• Atoms lose smaller particles.
• Energy and particles are released.

Explanation:

During radioactive decay an atom loses energy because mass is converted into energy and the big nucleus is converted into smaller one which means that new particles are formed. The decay of a radioactive element produces energy in the form of alpha, beta or gamma rays which are highly dangerous and toxic.