__________________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles.   a. An emission nebula   b. Hydrostatic equilibrium   c. The proton–proton chain   d. The thermonuclear fusion of hydrogen   e. A bipolar flow

Q: Describe the relative residence time of water in the ocean, the atmosphere, and in rivers and lakes.

A:  Residence time of any material is total time that that material has spent in the control volume. re...

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: Describe population growth and population regulation. Give an example of how density-dependent and d...

A: A population is a particular gathering of people, regardless of whether that gathering contains a co...

Q: If you measure apparent visual magnitude and you know absolute visual magnitude, you can solve direc...

A: If measure the apparent visual magnitude and know the absolute visual magnitude, we can determine th...

Q: A piece of charcoal is found to contain 30% of the carbon-14 that it originally had.(a) When did the...

A:   C-14 is a radioactive variety of carbon isotope. It is taken by all the organisms till they die. U...

Q: What atmospheric layer comprises most of the atmosphere’s mass and generates the weather?

A: The atmosphere is made up of several layers like Troposphere, Stratosphere, Mesosphere, Thermosphere...

Q: A parsec is roughly equal to   a. 3.26 light-years.   b. 3.26 AU.   c. 3.26 million kilo...

A: We measure length, mass, volume and all the physical and other quantities in some sort of scales and...

Q: Outline some factors in natural climate variability.

A: Natural climate variability refers to the changes in different parameters of climate due to non-anth...

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: Please help for evidence it’s about the city Boston

A: Temperature is the increasing or decreasing of heat that is caused do to atmospheric changes and bec...

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: 1. What are four kinds of erosion? 2. How can excessive fertilizer and irrigation be a problem? 3. W...

A:  Erosion is a process by which earth material like soil and sediment are carried away by any source ...

Q: Answer (i) and (ii)

A: Climate is the long-term average of the weather over almost 30 years. The primary factors of climate...

Q: I need help on the first question for reasoning and this is about the city boston

A: Temperature is the increasing or decreasing of heat that is caused do to atmospheric changes and bec...

Q: Other than petroleum and natural gas, what is the most valuable material taken from marine sediments...

A: Marine sediments are a sedimentary loads that are placed on the ocean surface. They are originated f...

Q: explain why certain sectors of society are more vulnerable to disaster than others?

A: Disaster is a sudden disruption of normal life causing severe damage to life and property to an exte...

Q: What explanation can you give for the bend in the Hawaiian-Emperor Chain?

A: Tectonic plates are piece of earth crust and upper mantle which together are called as lithosphere. ...

Q: Answer increase or decrease for both

A: Porosity & Permeability is determined by the number of pores and the capability of transmitting ...

Q: Why do we refer to only one world ocean? What about the Atlantic and Pacific oceans, or the Baltic a...

A: Earth is a terrestrial planet, which has a rocky surface. 71% of earth's surface is covered with oce...

Q: If you moved 4 times as far from a star, the star would appear   a. 4 times fainter.   b. 8 ...

A: We measure the brilliance of these stars utilizing the size scale. The greatness scale appears to be...

Q: A light curve measures   a. brightness vs. distance.   b. mass vs. luminosity.   c. brig...

A: The answer will be option c i.e. brightness vs. time. 

Q: Please answer

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

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: One of the properties of the planets that can be explained with collisions is     Answers:...

A: With the help of the collision, the unusual spin axis orientation of planets can be explained.

Q: Why are systems important in our environment?

A: The environment is something that is all around us. It is how we interact with the environment, deci...

Q: After close examination, you notice an erosional surface between the sandstone and shale, but the be...

A: An unconformity is a surface characterized by a period of erosion and non-deposition. An unconformit...

Q: Some of the largest floods of the past 20,000 years resulted from failure of ice dams. Explain this ...

A: Flooding is one of the most serious natural catastrophes. It occurs when excess water is collected i...

Q: How is seawater’s salinity expressed?

A: Water bodies on earth occupy the largest area. Oceans are the bigger versions of Seas. The seawater ...

Q: Please help me with this question within an hour urgently

A: The ecosystem is the geographical area where the living organisms live and interact with each other ...

Q: i) What do you understand by the term 'climate change'? State two evidences. ii) Explain how each of...

A: Climate is the long-term average of the weather over almost 30 years. The primary factors of climate...

Q: Explain about the Learning in Birds ?

A: Birds- Birds belong to the class aves and they are warm-blooded vertebrates. Aves are characterized ...

Q: In a binary system, the more massive star   a. is at the center of mass.   b. is farthest fr...

A: Our solar system which got formed around 4.6 billion years ago is a binary system where the sun is m...

Q: For the Northern Hemisphere, sketch a cross-sectional view of the Hadley, Ferrel, and Polar cells, u...

A: Earth looks like it is silent from above. But that's not the case. The atmosphere has circulating wi...

Q: 9. Describe the general pattern of sea surface temperatures in the ocean. 10. Examine the zone of wa...

A: Disclaimer: Only the answer to question 9 is given The temperature of the surface waters of the ocea...

Q: As environmental science student, think at least 5 ways in managing domestic wastewater discharge an...

A: Domestic wastewater is the water that is drained from the houses on a daily basis. this water needs ...

Q: Describe three kinds of relationships between two bodies of rock that indicate which of the two bodi...

A: Rock bodies are large scale rock which are present in a region which may be of any kind that is igne...

Q: In the H–R diagram, 90 percent of all stars are   a. in the giant region.   b. in the superg...

A: The H-R diagram is also known as the Hertzsprung-Russell diagram. For the study of stellar evolution...

Q: What is ‘stress’ in plants? What are the types of stress in plants?

A: Plants are essential producers on this planet. Plants provide enough oxygen, absorb carbon dioxide, ...

Q: List seven climate “wedges.”

A: Climate is the long-term average of the weather over almost 30 years. The primary factors of climate...

Q: What is the term for the breaking down of rock? O A. Weathering O B. Metamorphosis O C. Evaporation ...

A: Fragmentation of rocks and land formations occurs all the time through continuous processes that coi...

Q: Thinking Analytically How much wider has Iceland become because of seafloor spreading since the last...

A: The formation of Iceland began about 60 million years ago when the boundary between the Atlantic (th...

Q: Explain causes of freshwater shortages.

A: Freshwater shortages are driven by two converging phenomena such as  Increase in the usage and deple...

Q: What is the identity of this fossil? Brachiopod   Trilobite Gastropod Ammonit...

A: This is a trilobite fossil.

Q: Thinking Critically What evidence can you cite to support the theory of plate tectonics? What questi...

A: Plate tectonics is a new concept that accounts for the formation of earthquakes and volcanoes and th...

Q: Explain 1.Reduction of oxygen and increase in carbon dioxide in the atmosphere due to deforestation ...

A: Ocean acidification is defined as the gradual decrease in the ocean's pH. This implies that the ocea...

Q: Describe a dendritic stream pattern. What kind of underlying strata allows the development of a dend...

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question s...

Q: essay: Explain how human activity can affect the hydrometeorological cycle.

A: The Hydro-meteorological Cycle is commonly known as the hydrological cycle or water cycle. It is a c...

Q: Discuss the role of beach sand in providing protection from strong waves.

A: A beach is the flat mass of sand and gravel that is deposited on seashores. The sediment of the beac...

Q: Humans are causing global warming by burning wood, coal, natural gas, and oil and thus returning CO2...

A: Global warming at global temperatures has risen since 1950 and continues to rise. Global warming may...

Q: What is strata?

A: Sediments are naturally occurring material which are broken pieces of pre-existing rock which may be...