Block 14- Parallels and Meridian

Q4). What is the international Date Line?

Ans.
This us an imaginary line on the Earth that roughly follow the 180 degree line of Longitude.
It is exactly Opposite to the Prime Meridian.

Countries lying on the Eastern side of the International Date Line are One day Ahead  of the countries lying on the Western side.

Travel East to West lose one day.
Travel West to East Gain one day.

To Avoid confusion, this line has been drawn in a Zigzag manner so that it does not pass through any country.

Block 14 - Parallels and Meridians

Q2. What are the lines of latitude?

Ans.
Lines of Latitude are the Imaginary Horizontal lines running East to West circling the Earth. These lines are Parallels because they are Parallel to each other and never meets.

(For a long answer answer add these lines)

The lines are shorter towards the Poles.
There are a total 180 latitudes. That is 0 to 90 North in Northern Hemisphere and 0 to 90 South in Southern Hemisphere.