A planetary nebula   a. produces an absorption spectrum.   b. produces an emission spectrum.   c. is contracting to form planets.   d. is contracting to form a star.   e. is the result of carbon detonation in a 1 M star.

Q: When tectonic plates collide, mountain ranges form. You are investigating rock formations in a tecto...

A: Sandstones are the arenaceous rock composed of sand-sized individual particles. The rock in the imag...

Q: Earthquakesa. If an earthquake has an intensity of 1000 times I0,what is the magnitude of the earthq...

A: Earthquake is violent shaking of the ground. This is caused by energy released by the lithosphere wh...

Q: How the grain-size distribution of coarse-grained soil is determined ?

A: Soil is the uppermost layer of Earth, which is a mixture of minerals, organic matter, gas, water, et...

Q: Why weather forecasting important?

A: Let us discuss something about the weather, Weather: The state of the atmosphere like hot or cold, w...

Q: If there are thresholds for pollution effects, is it reasonable or wise to depend on environmental p...

A: `After the industrial revolution, the emission of greenhouse gases has increased to an extent. The r...

Q: In a distant planetary sytem, a plant is at a distance of 2 AU from its star. the brightness of the ...

A: INTRODUCTION: The luminosity of a star is described as the net electromagnetic radiation which a sta...

Q: True or False.   Oil shale is very poorly named. The rock is sedimentary but not necessary to be a s...

A: It is a true statement. The oil shale poorly named, it is a sedimentary rock but not necessary to be...

Q: A main-sequence star is 20 times more luminous than the sun. How massive is it?

A: Luminosity is a measure of electromagnetic power or radiant power emitted by light emitting object. ...

Q: How are strontium isotopes useful in dating rocks?

A: Geology is the branch of science that studies the Earth. Geology studies the past, present, and futu...

Q: What actions could be taken to reduce rainwater runoff in cities?

A: The earth's system is composed of four subsystems, namely the hydrosphere, lithosphere, atmosphere, ...

Q: ANALYZING.  GIVEN THE FOLLOWING SCENARIOS, ANSWER WHAT IS ASKED.  A storm hit a certain area. After ...

A: A storm is an extreme condition of disturbance of the weather. During it, fierce winds, lightning, a...

Q: How does the process that turns clay into shale differ from the process that turns sand into sandsto...

A: Geomorphology is the study of the landforms, structures, features, how they have formed, the sedimen...

Q: If there are 1.2 billion atoms of Potassium-40 and 8.4 billion atoms of Argon-40 in what is consider...

A: Radiometric dating is a method of determining the lifespan of a specific object that contains a radi...

Q: Estuaries are classified by their origins. What types of estuaries exist?

A: An estuary is a mostly encased waterway shaped where new water from land meets and blends in with sa...

Q: How and when did the Earth come to be?

A: The model formation of Earth came from the Nebular hypothesis.  Shortly after the big bang, a large ...

Q: Help me please

A: Hertzsprung Russell diagram or H-R diagram is a plot of star where all stars are placed with respect...

Q: Sedimentary and metamorphic rock are informally classified as "secondary rock types".  What does thi...

A: rocks and ore are naturally occurring solid mass or aggregate of minerals which are valuable in natu...

Q: ___________________________ are small luminous nebulae excited by nearby young stars.   a. T-Tau...

A: Nebula is object in space which contain giant cloud of dust and gases. this are usually the region w...

Q: A planetary nebula is   a. the expelled outer envelope of a medium-mass star.   b. produced ...

A: Ever since the beginning of the Universe, matter and energy were created. These matters and energy e...

Q: The Algol paradox is explained by considering   a. the degenerate nature of the hydrogen on the ...

A: In astronomy , the Algol paradox is an incomprehensible circumstance when components of a double sta...

Q: What’s happening to the lava in the lava lake inside the volcano in Ethiopia? What largescale proces...

A: In the lava lake, lava flows like fountains. Currently, the lava lake is increasing again because of...

Q: Computer engineering question

A: # cook your dish here mod=1000000007 def mmul(A,B):     s=len(A)     C=[[0 for i in range(s)]for j ...

Q: Starlight passing through interstellar dust becomes   a. fainter and redder.   b. brighter a...

A: Option a will be right answer.

Q: What is environmental literacy?

A: The environment is composed of all the living and non-living things on earth. It can imply the entir...

Q: Stars with masses between 0.4 M and 4 M   a. undergo thermonuclear fusion of hydrogen and helium...

A: The universe is formed around 13.8 billion years ago. At the time when it got formed, it was a size ...

Q: Bok globules contain   a. 1–2 solar masses.   b. 10–1,000 solar masses.   c. 10,000–1,00...

A: Bok globules are small, dark, isolated, opaque, and compact molecular clouds made up of cosmic dust,...

Q: What tools to use without technology in forecasting weather?

A: To predict the weather condition of the atmosphere is called weather forecasting. Weather forecastin...

Q: We seem instinctively to know whether something is alive or not. How do you suppose we make that jud...

A: When we look around we see many thing around us like cars, building , animals, mountains, rivers etc...

Q: Explain why the Lower Peninsula of Michigan does not have much exposed bedrock.

A: Lower peninsula of Michigan or lower Michigan is the southern part 2 landmass which make up the stat...

Q: What is the difference between spectral class and luminosity class?

A: Stellar classification is a classification or categorisation of stars on the basis of their spectra,...

Q: What percentage of stars are in binary systems?   a. 10% or less   b. 20%   c. 30%   ...

A: Stars are those parts of universe which act as center of innumerable galaxies in the universe. There...

Q: The free-fall contraction of a molecular cloud   a. can be initiated by shock waves from superno...

A: The free fall contraction of a molecular cloud can be initiated by shock waves from supernovae.  The...

Q: ANSWER IN 3 TO 5 SENTENCES. WHY IS IT STILL IMPORTANT TO OBSERVE DISASTER RISK REDUCTION RELATED LAW...

A: Disaster risk reduction (DRR) is defined as a systematic way of identifying, assessing and reducing ...

Q: Describe the process of using spectroscopic parallax to determine the distance to a star.

A: Ever since the beginning of the Universe, matter and energy were created. These matters and energy e...

Q: Which stars produce energy using the proton–proton chain?   a. Low-mass main-sequence stars. ...

A: Nuclear fusion is a process in which 2 or more atomic nuclei are combined to form one or more differ...

Q: What’s convergent evolution?

A: Firstly, let us discuss something related to convergent, Convergent: coming closer together  

Q: A parsec is the   a. average distance between Earth and the sun.   b. the distance that ligh...

A: Astronomy is study of all the object and matter in the universe after the earth atmosphere, this inc...

Q: Be aware that a number of “costs” are not considered above.  It might be appropriate, for example, t...

A: Without home heating, the carbon footprint is taken as 1 ton of CO2  For home heating, amount of fue...

Q: What are the main concerns about global warming in general?

A: Greenhouse gases commonly form an envelope surrounding the earth and take most infrared radiations a...

Q: The Chandrasekhar limit tells us that   a. accretion disks can grow hot through friction.   b...

A: Ever since the beginning of the Universe, matter and energy were created. These matters and energy e...

Q: Synchrotron radiation is produced by   a. objects with temperature below 10,000 K.   b. high...

A: The electromagnetic energy emitted by the charged particles moving ata high speed is known as Synchr...

Q: Are there enough resources in the world for 8 or 10 billion people to live decent, secure, happy liv...

A: Any material that constitutes to be a part of the earth that is valued by the people and is needed b...

Q: what is the importance of weather forecasting?

A: Weather forecasting involves the use of science and technology to forecast atmospheric conditions fo...

Q: When do El Niño and La Niña usually happen?

A: The EL-Nino and La Nina are episodes of 9-12, months and tend to form during the spring and reach pe...

Q: The ____________________________ is the nuclear fusion of three helium nuclei to form a carbon nucle...

A: Proton-Proton chain or p-p chain is a nuclear fusion of hydrogen to helium. The Carbon-nitrogen-oxyg...

Q: please answer question 6

A: 6.  New York The actual temperature is 15°F and dew point is 14°F. It only one degree fall in the te...

Q: How about marine aquarium fishes? Are we wrecking reef ecosystems by buying them?

A: Aquarium fishes are the stored types of fishes. These types of fishes are stored with the help of cy...

Q: We started with 80mm of soil in the mason Jar.  In some cases, after seperation of the sand, silt an...

A: Soil is a combination of clay, silt, sand and organic matters. They together form soil. The mason ja...

Q: ANALYZING. given the following scenarios, answer what is asked. you lived in the countryside. one ni...

A: An earthquake is the tremendous shaking of thee the surface of the earth. This is caused due to the ...

Q: The brightest luminosity class is   a. Ia.   b. Ib.   c. IV.   d. V.

A: Luminosity is a measure of electromagnetic emitted power light emitting object. In astronomy it is u...