What caused the 5 mass extinctions? The most commonly suggested causes of mass extinctions are listed below. Flood basalt events. The formation of large igneous provinces by flood basalt events could have: Sea-level falls. Impact events. Global cooling. Global warming. Clathrate gun hypothesis. Anoxic events. Hydrogen sulfide emissions from the seas. Can global warming cause […]
Why is the sodium potassium pump so important to the human body?
Why is the sodium potassium pump so important to the human body? In the kidneys the Na-K pump helps to maintain sodium and potassium balance in our body. It also plays a key role in maintaining blood pressure and controls cardiac contractions. What human body system depends on the sodium potassium pump? nervous system Why […]
What particle size is the easiest to erode?
What particle size is the easiest to erode? In a stream, the most easily eroded particles are small sand grains between 0.2 mm and 0.5 mm. Anything smaller or larger requires a higher water velocity to be eroded and entrained in the flow. What increases the size of particles carried increases? The average velocity (speed) […]
What happens when Aluminium is burnt in the presence of oxygen?
What happens when Aluminium is burnt in the presence of oxygen? Reaction of aluminium with air So, normally, aulumium metal does not react with air. If the oxide layer is damaged, the aluminium metal is exposed to attack. Aluminium will burn in oxygen with a brilliant white flame to form the trioxide alumnium(III) oxide, Al2O3. […]
How do you classify archaea?
How do you classify archaea? Archaea, (domain Archaea), any of a group of single-celled prokaryotic organisms (that is, organisms whose cells lack a defined nucleus) that have distinct molecular characteristics separating them from bacteria (the other, more prominent group of prokaryotes) as well as from eukaryotes (organisms, including plants and … What two groups does […]
What is the effective resistance between A and D?
What is the effective resistance between A and D? D=5Ω+10Ω+5Ω=20Ω What is the effective resistance in the given circuit? The effective resistance of a circuit containing resistances in parallel is smaller than any of the individual resistances. For example : R1=2Ω and R2=3Ω ∴ Effective resistance Rp1=R11+R21. Maximum effective resistance will be when all the […]
What is the half-life of AU 198?
What is the half-life of AU 198? 2.697 days How do you calculate the half-life of sodium 24? Notice that the time period between each of the yellow crosses is 15 hours. This tells us that the count rate of Sodium-24 halves every 15 hours. In other words, the activity of Sodium-24 is halved every […]
Can a burnt out light bulb?
Can a burnt out light bulb? Regardless of the bulb type, if your light bulbs keep burning out long before they should, it’s time to investigate. There are many possible reasons why a light bulb burns out quickly: The power supply voltage may be too high. Bulbs may be loose or connected improperly. How do […]
What are three lung diseases that can be caused by air pollution?
What are three lung diseases that can be caused by air pollution? Air pollution is the cause and aggravating factor of many respiratory diseases like chronic obstructive pulmonary disease (COPD) (11,12), asthma (12,13), and lung cancer (14,15). Who is most affected by air pollution? The groups most affected by air pollution are people of color, […]
When the moon passes between Earth and the sun it casts a shadow on?
When the moon passes between Earth and the sun it casts a shadow on? When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. Lunar eclipses can only happen when the Moon […]