Explanation

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planet's volume.

Explanation

The ozone layer protects the Earth against most UVB coming from the sun.

Explanation

The color of water varies with the ambient conditions in which that water is present.

Explanation

Iodine and sodium are essential for animals and are not required by most of the plants however, iodine is found in certain marine algae.

Explanation

A lunar eclipse occurs when the Moon moves into the Earth's shadow.

This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two, and only on the night of a full moon.

Explanation

Bacteria are microscopic, single-celled organisms that thrive in diverse environments.

Explanation

Dengue is caused by insect bites.

Explanation

Pellagra is a disease caused by a lack of the vitamin niacin (vitamin B3).

Symptoms include inflamed skin, diarrhea, dementia, and sores in the mouth.

Areas of the skin exposed to either sunlight or friction are typically affected first.

Explanation

·         The path of traffic noise can be locked by constructing vertical barriers along the highways.

·         Proper highway planning and design are essential for controlling traffic noise.

·         Establishing lower speed limits for highways also reduced the noise.

Explanation

Manifest and latent functions are social scientific concepts created by anthropologist, Bronislaw Malinowski in 1923 while studying the Trobiand Islanders in the Western Pacific.