explain it for me plz

Hi nobleresearcher,

A hemisphere is half of a sphere or globe.

"Q:  What is a hemisphere?
A:  Half of the earth's surface. There are four hemispheres, Northern
and Southern (divided by the equator) and the Eastern and Western
(divided by the Prime Meridian and 180°)"

http://www.coe.ilstu.edu/jabraun/Spring02/c&i258.05/public/webquests/mathis/faq.htm


"A hemisphere is literally half of the Earth, usually resulting from
the division of the globe into two equal parts, north and south or
east and west (divided at the equator and prime meridian)."

Maps.com: Specific Locators on the Map 
http://www.maps.com/reference/geoshelf/skills/skl-locators.html


"A hemisphere is any half of earth's surface; the term comes from the
Greek word for half a sphere. The equator (zero degrees latitude)
divides the earth into the Northern Hemisphere and the Southern
Hemisphere. The dividing line between the Eastern and Western
Hemispheres is not so well defined, but it is often placed at the
Prime Meridian (zero degrees longitude) or at 20 degrees west
longitude.

North and South America and surrounding waters are considered to be in
the Western Hemisphere, while the continents of Europe, Africa, Asia,
and Australia are considered to be in the Eastern Hemisphere."

Student's Friend 
http://www.studentsfriend.com/sf/part1see/unit1-1.html


Search criteria:
"a hemisphere is"

I hope this helps.

Best regards,
Rainbow

One half of a sphere or globe. The northern hemisphere on Earth is
divided from the southern hemisphere by the equator.