(i) Mountains make up more than a quarter of the planet's land mass. These surfaces provide resources for nearly 700 million people through out the world.
(ii) Mountains provide energy resources, food and water to people all around the world.
(iii) But climate change could cause mountains to shrink.
(iv) Deforestation has also been a threat while natural disasters often damage many mountains.
(v) Mountains are among the most beautiful land masses in the world. So like conservation of forests, conservation of mountains also equally important.

Prepare slogans, posters and placards to celebrate International Mountain Day.
(i) "Mountains are among the most beautiful land masses in the world."
(ii) "Mountains are beautiful as they rise up above the clouds and show just how grand the world can be."
(iii) "Great things are done when men and mountains meet."
(iv) "How glorious a greeting the Sun gives the mountains."
(v) "Mountains are earth's undecaying monuments."
(vi) "The mountains, forests and seas render men savage, they develop fierce, but yet do not destroy the human. "
(vii) "Men stumble over pebbles, never over mountains."
(viii) "Each fresh peak ascended teaches something."
(ix) "Mountains are the beginning and end of all natural scenery."
(x) "He who climbs upon the highest mountains laughs at all tragedies, real or imaginary.

1. Valley
2. Third Order
3. Erosion

(i) The important features of the pacific ocean:
(ii) The pacific ocean is the largest and deepest ocean on the earth.
(iii) It covers about one-third of the earth's total area and spreads for about 168.72 million sq.km
(iv) This oceans shape is roughly triangular with its apex in the north at the bering strait which connects the pacific ocean with the arctic ocean.
(v) The bering sea, the china sea and the Philippines sea, the sea of Japan and Tasman sea are some of the marginal seas of the pacific ocean.
(vi) Indonesia, philippines, japan, hawaii, newzealand are some of the islands located in this ocean.
(vii) The deepest point mariana trench is 10,994m and is located in the pacific ocean.
(viii) A chain of volcanoes is located around the pacific ocean called the pacific ring of fire.

Plains are highly populated.
Reason:
(i) Plains are a flat and relatively low-lying lands.
(ii) Plains are usually less than 200 metre above sea level.
(iii) Most plains are formed by rivers and their tributaries and distributaries.
(iv) These plains are used extensively for agriculture due to the availability of water and fertile soil.
(v) They are most suitable for human inhabitation.
(vi) Hence, they are the highly populated regions of the world.
(vii) The Indo-Gangetic plain in North India is one of the largest plains in the world.
(viii) The plains formed by river cauvery and vaigai are important plains found in tamil nadu.

Plateaus:
(i) Plateaus are the elevated portions of the earth that have flat surfaces bounded by steep slopes.
(ii) The elevation of plateaus may be a few hundred metre or several thousand metre.
(iii) Tibetan plateau is the highest plateau in the world.
(iv) So, it is called as the 'Roof of the world'.
(v) The flat lopped part of the plateau is called tableland.
(vi) The plateaus are generally rich in minerals.
(vii) The Chota Nagpur plateau is one of the mineral rich plateaus in India.
(viii) Therefore, rnining is one of the major aclivities of the people living here.
(ix) The deccan plateau in peninsular india is of volcanic origin. Dharmapuri plateau, coimbatore plateau, madurai plateau are found in tamil nadu.

CLASSIFICATION OF LAND FORMS:
First Order:
Continents: The vast land masses on earth are called continents.
Oceans: Oceans are vast expanse of water.
Second Order:
Mountains: A landform that rises 600 metre above its surroundings and has steep slopes is called a mountain.
Plateaus: Plateaus are the elevated portions of the earth that have flat surfaces bounded by steep slopes.
Plains: Plains are a flat and relatively low lying lands.
Third Order:
(i) Third order landforms are formed on Mountains, plateaus, and plains mainly by erosional and depositional activities of rivers, glaciers, winds and waves.
(ii) Valleys, beaches and sand dunes are some examples of the third order landforms.

Third order of land form.

Oceans are vast expanse of water.

The Atlantic ocean is bounded by North America and South America in the West, and Europe and Africa in the East.

The vast land masses on Earth are called Continents.

a. Bay of Bangal
b. North America and South America
c. Almost completely surrounded by Eurasia and North America.
d. Palk Strait.
e. Indian Ocean to the west, the South Pacific Ocean to the East and the Southern
Ocean to the South.
f. Isthumusses -ANarrow piece ofland connecting two larger areas across an expanse of water. Isthumus of Panama - Central America.