___________________ is the thermonuclear fusion of hydrogen to form helium operating in the cores of low-mass stars on the main sequence.   a. The CNO cycle   b. The proton–proton chain   c. Hydrostatic equilibrium   d. The neutrino process   e. The heavy-element process

Q: Which best describes the percentage of stars that are in binary systems?   a. less than 10 perce...

A: The answer will be option d i.e. greater than 90%.

Q: What are the three main types of nebulae

A: Nebula is an interstellar cloud of dust and gases such as hydrogen and the helium. The cloud is form...

Q: Because of the dust in the interstellar medium, a star will appear to an observer on Earth to be ...

A: Interstellar medium is matter that is present in the space between stars in the galaxy. This can inc...

Q: Has anything similar to Earth’s weather patterns been seen on other planets?

A: The Earth is enclosed by a blanket of gases called the atmosphere. The atmosphere serves as a protec...

Q: ANALYZING.  GIVEN THE FOLLOWING SCENARIOS, ANSWER WHAT IS ASKED.  1. You lived by the countryside. O...

A:   There are several ways to avoid those hazards. Certain prevention methods were different for diffe...

Q: Why is the study of soil biology important in today’s world? In your answer, consider this quote:  “...

A: The basic component of a landmass that is necessary for all the land on earth to exist in the soil. ...

Q: What accounts for the abundance of chalk in the Cretaceous System?

A: Cretaceous is a geological period that began about 145 million to 66 million years ago. The third an...

Q: Google search your choice: Chestnut Blight in the Americas, Dutch Elm Disease or Smallpox in regards...

A: A disease in an infection that is spread from one individual of a species to another individual by c...

Q: To determine the period of a visual binary, we must measure   a. brightness.   b. position. ...

A: To determine period of revolution, the astronomers need the distance of binary (position).

Q: Could you answer each four sections on the photo

A: Earth science is the study of the Earth and the various processes that are going on in the Earth sys...

Q: Describe smelting and some of its environmental effects

A: The extraction and processing of metals produce several gases in the environment. Some of these gase...

Q: Which phrase best describes the water cycle? O A. An evaporating process O B. A varying process O C....

A: The water cycle is the movement of water through the lithosphere, atmosphere, biosphere, and hydrosp...

Q: 1. Based on the picture, enumerate the different evidences or effects of climate change. 2. How do g...

A: Climate is not a stable thing but in fact it always keeps on changing. Climate change is a long-term...

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: Helium fusion occurs at temperatures above   a. 6000 K.   b. 15,000,000 K.   c. 100,000,...

A: Fusion is a process in which 2 or more nuclei act upon each other and combine to form a new and heav...

Q: Opacity is   a. the balance between the pressure and force of gravity inside a star.   b. th...

A: Opacity is a property which define penetrability of electromagnetic radiation (infrared, visible lig...

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

A: This is a trilobite fossil.

Q: What allows magnesium to substitute freely for iron in olivine?

A: Olivine is a silicate mineral and the building block of such minerals is the silica tetrahedron. It ...

Q: Why can you use parallax to determine the distance only to relatively nearby stars?

A: Parallax is the displacement or difference in apparent position of an object viewed along 2 differen...

Q: How can we say that the universe is flat? Is there evidences that the universe is flat?

A: The shape of the universe, in apparent cosmology, is the geometry of the local and the geometry of t...

Q: A spectroscopic binary shows periodic variations in its   a. radial velocity.   b. proper mo...

A: Binary stars are stars with 2 stars orbiting them. they usually appear as single point light source ...

Q: 4. How do you compare climate on land and climate near the sea? 5. Why do you think some locations t...

A: The Earth is enclosed by a blanket of gases called the atmosphere. The atmosphere serves as a protec...

Q: Define the term - Seismic design situation ?

A: Earthquake is shaking of the surface. They are caused by the sudden release of energy in the Earth's...

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: Water Pollution: Indicate which statements are true and which are false The BOD of a system is a mea...

A: Water pollution is the addition of harmful substances to water, which can be chemicals or microorgan...

Q: How far would the sun (absolute visual magnitude = 4.83) have to be to be barely visible to the unai...

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

Q: What land and air conditions make the central United States the tornado capital of the world?

A: The Earth is made up of four spheres known as lithosphere, atmosphere, hydrosphere, and biosphere. A...

Q: Thinking Critically What do the facts that (a) granite underlies the edges of continents and (b) bas...

A: Earth is the third planet in the solar system. It is a terrestrial planet, meaning it has a rocky su...

Q: Which types of stars have the thinnest spectral lines?   a. Ia   b. Ib   c. III   d. ...

A: Hertzsprung-Russell Diagrams is the diagram between luminosity of stars and their effective temperat...

Q: 1. CITE ONE KEY POINT ABOUT COMMUNITY-BASED DISASTER RISK REDUCTION AND MANAGEMENT THAT CAN BE APPLI...

A: Community-based disaster management is disaster management at a local level. Certain communities can...

Q: What basic forces produce the main ocean currents?

A: Oceans are the largest water bodies on the earth. The currents that are present in the ocean are cal...

Q: A star’s classification is K5 III. What type of star is this?   a. supergiant   b. giant ...

A:  It is a main sequence star.

Q: Which of the following stars is most dense?   a. a supergiant star   b. a main-sequence star...

A: White dwarfs are only half massive of sun but they are more times denser than the sun. White dwarfs ...

Q: Air Mass Worksheet కలో Locations B, C, D. and I are considered colder climates. Letter Hot/Cold Air ...

A: Air mass- an air mass is defined as a parcel of air having unique characteristics such as temperatur...

Q: In the early history of their formation, Venus, Earth and Mars all had a similar     Answe...

A: Let us discuss something about Venus, Earth, and Mars, Venus, Earth, and Mars all are very similar f...

Q: Answer increase or decrease for both

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

Q: There is always room for improvement in the implementation of the government’s actions or response d...

A: Disasters and calamities occur naturally as well as by anthropogenic activities. The people get affe...

Q: Thinking Analytically How much heat is required to melt a quart of ice resting at 0°C?

A: Water is the only substance on the earth that exists in all three states of matter, i.e., ice, liqui...

Q: Reefs are commonly porous structures that serve as traps for petroleum. If you wanted to drill for o...

A: A Reef is a rock aggregate that lies above the surface of the ocean. It is often under the action of...

Q: Describe several earth resources of economic value.

A: Resources are the supplies of the products from which we can benefits. They can be of two types- nat...

Q: The lower edge of the main-sequence band is known as ______________________ and represents the locat...

A: Main sequence is a continuous distinctive band which is plotted of a visible star on a graph by comp...

Q: Follow the directions of the image

A: The law of conservation of mass expresses that mass in a confined framework is neither made nor anni...

Q: A test cylinder of rock has a diameter of 12.6 cm and a length of 14 cm. When dry its weight is 50 N...

A: Porosity is explained as the ratio of void spaces (gaps) to that of the total volume of the rock sam...

Q: What factors affect sea level and the location of a coast?

A: The following factors affect the sea levels: shrinking or growing of ocean basins. thermal expansio...

Q: Why is plastic so dangerous to marine organisms?

A: The ocean is home to a variety of organisms. The increasing use of plastic and plastic pollution in ...

Q: What is the differences of relative and absolute dating?

A:   Earth’s history is filled with various activities since its inception. Nature records its history ...

Q: Answer increase or decrease for both

A: Humus is a black, organic matter formed in the soil where plant and animal matter rot; when plants d...

Q: Why is atmospheric circulation between the two hemispheres centered about the meteorological equator...

A: The rotation of the atmosphere is longitudinal and lateral air movements, forming cycles of various ...

Q: Why does our climate keep on changing over time?

A: The change in weather that takes place gradually because of the change in the temperature globally o...

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...