Answer:
a. is actually variable.
Explanation:
Earth's solar constant -
It refers to the total amount of radiations coming from the sun per unit area and per unit time on the surface of the earth , is referred to as Earth's solar constant .
There is an increase of about 0.2 percent during the peak of every 11 year solar cycle and hence ,
The amount is variable in nature .
Since , the sun is composed of hydrogen gas , which increases to around 10 percent on every billion year .
Hence , from the given question ,
The correct option is a. is actually variable.
Answer:
this may help you solve the problem! :D
Explanation:
Negative air ions (NAIs) have been discovered for more than 100 years and are widely used for air cleaning. Here, we have carried out a comprehensive reviewing on the effects of NAIs on humans/animals, and microorganisms, and plant development. The presence of NAIs is credited for increasing psychological health, productivity, and overall well-being but without consistent or reliable evidence in therapeutic effects and with controversy in anti-microorganisms. Reports also showed that NAIs could help people in relieving symptoms of allergies to dust, mold spores, and other allergens. Particulate matter (PM) is a major air pollutant that affects human health. Experimental data showed that NAIs could be used to high-efficiently remove PM. Finally, we have reviewed the plant-based NAI release system under the pulsed electric field (PEF) stimulation.
Answer:
yeild solid iron
Explanation:
When two solutions of ionic compounds are mixed, a solid may form. This type of reaction is called a precipitation reaction, and the solid produced in the reaction is known as the precipitate.
So as not to mix types in a recovery system and to alert you to the presence of dangerous hydrocarbons like propane.
It’s cool aaaa you become more