Explanation

Lithium is the lightest metal.

Density of 0.534 g/cm³.

It is an alkali metal,

The third element on the periodic table,

It is soft enough to be cut with a knife.

Uses: Due to its low density and high reactivity, it's used in aircraft and, famously, in the production of batteries for electric vehicles and consumer electronics. 

Explanation

Studies show that it takes an average of 8 minutes and 20 seconds for sunlight to move from the sun to the earth.

Sunlight moves at the speed of light.

You can see that the distance of the sun from the earth = 149.6 x 106 km.

Photons emitted from the surface of the sun need to traverse the vacuum of the universe to reach our eyes.

Explanation

The Moho Discontinuity is the boundary between the Earth's crust and mantle, named after seismologist Andrija Mohorovicic.

It is identified by a sudden increase in seismic wave velocities, indicating a change in rock composition.

Explanation

AND, OR, and NOT are logical operators (also known as Boolean operators). 

These operators are fundamental to computer programming, mathematics, and digital electronics because they work with and return Boolean values (either True or False, often represented as 1 and 0). 

Explanation

John Dalton is considered the 'Father of Modern Atomic Theory.

He raised the atomic theory that acted as an explanation of the following two laws.

Law of conservation of mass – According to the law, mass can neither be destroyed nor created in any chemical reaction.

Explanation

Fever is called a protective strategy because it helps the body fight infection.

When the body’s temperature rises, it slows down the growth of pathogens (bacteria and viruses) and stimulates the immune system to respond more effectively.

Explanation

The sun's energy, called solar radiation, isn't equally distributed across the globe because of Earth's spherical shape.

This “unequal helping” of solar radiation across our planet is effectively what causes weather and climate.

Explanation

The study of parasites is called Parasitology.

It is a branch of biology focusing on parasites, their hosts, and their relationships, often studied in microbiology and veterinary science for diagnosis and treatment of parasitic diseases.

Explanation

When the moon isn't visible from Earth, it's the New Moon phase, occurring when the Moon is between the Earth and Sun, so the sunlit side faces away from us, making it appear dark or invisible. 

New Moon

Full Moon (fully visible)

 First Quarter (half visible)

 Last Quarter (half visible) 

Explanation

The Waxing moon refers to the phase when the visible portion of the moon is increasing.

It moving from new moon towards full moon.