Explanation

The element required for solar energy conversion is silicon: 

Silicon is the most common semiconductor material: Silicon is used in about 95% of solar cells sold today. 

Silicon is a naturally occurring element: Silicon is the second most abundant element on Earth, after oxygen

Explanation

Sulfur and nitrogen compounds in the atmosphere can combine with water and oxygen to form sulfuric acid and nitric acid, leading to acid rain.

Acid rain is a type of precipitation that contains high levels of sulfuric and nitric acid, which can harm the environment, infrastructure, and human health.

Explanation

While creep is a slow and gradual process, it's still not recommended to try to outrun any mass wasting phenomenon.

Creep can still be unpredictable and may accelerate suddenly, making it dangerous to be in the area.

Explanation

For water, the boiling point is 100ºC at a pressure of 1 atm

The boiling point of water decreases at higher altitudes due to Low atmospheric pressure

The boiling point of water increases with increased atmospheric pressure

The boiling point of water decreases with decreased atmospheric pressure

ND17-1-2023

Explanation

The elements of the periodic table sorted by atomic number

Atomic number Name chemical element                 Symbol

1                         Hydrogen                                             H

2                         Helium                                                     He

3                         Lithium                                                      Li

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RY 15-01-2023