One third.

1. Igneous rocks      2. Sedimentary rocks   and   3. Metamorphic rocks.

Rocks formed by the molten magna - solidification from the interior of the Earth.

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Primary rocks - as other rocks originate from them.

Granite - Major continental rocks. Basalt - found on the ocean beds.Volcanic - formed by the solidification of lava ejected from volcanoes.

Basalt.

Solidification of lava ejected from volcanoes.

Granite.

Formed from sediments deposits on the ocean beds.

Accounts for only 5% of the Earth's surface but covers about 75% of total land mass

Made up of weathered remains of the Igneous rocks, containing organicmatter from the remains of marine organisms.

STRATIFIED ROCKS because they form in horizontal layers.

Millions of years to harden into rocks.

1. Gypsum    2. Chalk    3. Limestone    4. Peat    5. Lignite    6. Bituminous CoalAntracite    7. Gravels    8. Pebbles   9. Shingle   10. Sandstone    11. Clay    12. Clay Stone.

Formed by deposition created by chemical action or sedimentation.

Formed by organic matter or marine remains.

Formed by the deposition of sediments in water.

Change in the structure of rocks under pressure, heat et., which turns Limestone into marble, granites into Gneiss (coarse grained granite like rock) formed of layers of feldspar, quartz, mica etc.

Original Igneous rocks or sedimentary rocks becoming metamorphic, due to pressure, intense temperature or by the reaction of water and chemical presence.

SLATE: formed by compression of sedimentary rocks like Shale, and mud stone.

GNEISS: formed by metamorphosis of igneous rocks like Granite.

QUARTZITE: Formed from sedimentary rocks like Sandstone.

MARBLE: Sedimentary rock like Limestone turns into Marble under extreme heat.

Powdery form of earth, a combination of rock, minerals, fragments caused by weathering due to wind, rain, sun, snow, etc., and contains organic matters.

The uppermost layer of soil, usually the top 15 to 20 cms having the highestConcentration of organic matter and microorganisms. Plants concentrate their roots here and obtain most of their nutrients.

Soil or sediments deposited by a river or other running water. Made up of variety of materials including fine particles of silt, clay and large parts of gravel and sand.

Also called Muck. Made up of primarily Humus (Organic matter) from drained swamp land.

The fine sand or silt brought down by rivers and deposited in river beds or banks.

Tiny granular particles of rocks etc., formed by the collision of rocks in movement between them caused by river movement or other modes.

Solid unweathered rock lying beneath the soil and subsoil. A term forSolid rock.

A soft mineral consisting of form of carbon.

A reddish porous rock produced by weathering, found mainly in humid Tropical regions like India, Indonesia, Sudan and South Americ

Cement.

Sandstone.

Wearing away of parts of the Earth's surface by the rubbing action of the wind, water, ice and the movement of the debris.

The gradual building up of water borne material such as mud and sand in an area that is regularly flooded.

The constant wearing dwon of pieces of rock into even finer particles as they are carried along by wind, water and ice.

Height or elevation of a place, normally measured and mentioned as "Above Sea Level".

LIVERPOOL, UK - As the sea level undergoes changes with the tides, a standard sea level at Liverpool UK has been fixed as the "Mean Sea Level". The is the zero line from which the height of a place, in the world is decided.

When a basin shaped layer of porous rock on the Earth's crust is trapped between layers of non-porous rock, water accumulates in the porous rock forming an Artesian Basin.

It is made by boring down to saturated layers of rock in an Artesian Basin.

Soft semifluid layers of rock on which earth's continents and ocean floor float.

A zone around an igneous rock intrusion which has been altered by the heat and chemicals, generated during the interaction/intrusion of the magna (hotmolten rock).

A planer rock fracture which shows evidence of movement.

A tall thin spires of rock that protrude from the bottom of arid basins and bad lands.

A thick of mass of wet, loose and unstable sand formed at the mouth of a river on the sea coast.

Sudden downhill movement of masses of rock and soil, caused by vibration ofearthquake or wearing away of loose rocks and soil due to heavy rain.

Asthenosphere.

Nitrogenous content.

A single massive stone or rock, or a single piece of rock placed as or within a monument.