"Bardoli Chheerha":

1) Is a local storm of hot whether season of Assam.
2) Nor Westers, These are dreaded evening thunderstorms in Bengal and Assam. Their notorious nature can be understood from the local nomenclature of ‘Kalbaisakhi’, a calamity of the month of Baisakh.
3)These showers are useful for tea, jute and rice cultivation. In Assam, these storms are known as “Bardoli Chheerha”.
#prelims #Geography

Milankovitch Cycles:

1-The episodic nature of the Earth's glacial and interglacial periods within the present Ice Age (the last couple of million years) have been caused primarily by cyclical changes in the Earth's circumnavigation of the Sun.
2-Variations in the Earth's eccentricity, axial tilt, and precession comprise the three dominant cycles, collectively known as the Milankovitch Cycles.
3-The three Milankovitch Cycles impact the seasonality and location of solar energy around the Earth, thus impacting contrasts between the seasons.
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Sources of information about earth interior,
1. Direct sources- surface rock obtained by mining and
volcanic eruptions.
2. Indirect sources-
 Analysis of properties of matter like temperature,
pressure and density of material.
 Meteors these solid bodies structure and material is
similar to earth.
 Gravity anomaly which gives us the information
about distribution of mass of material in the crust of
earth.
 Magnetic surveys gives information about magnetic
material distribution in crustal portion.
 Seismic activity important source about interiors of earth

#Geography #Prelim 2020

Sea Floor Spreading:
 The idea that the seafloor itself moves as it expands
from a central axis was proposed by Harry Hess.

#Geography #Prelim 2020

Continental Drift Theory:
 This theory was suggested by Alfred Wegener in
1920’s.

#Geography #Prelim 2020

Geyser and Hot Springs:

*Geyser – fountain of hot water and superheated
steam from earth beneath in which water is heated
beyond boiling point with explosion.
*World major geyser are concentrated in Iceland,
Rotorua (N. Island, New Zealand), Yellowstone
National Park (USA) – Old Faithful world’s best known
geyser.
*Hot Springs or thermal springs – water rises to the
surface without any explosion and consist of dissolved
minerals. Ex: Hawaii and Japan.
Earthquakes

#Geography # Prelim fact

EARTHQUAKE-
An earthquake is the shaking or trembling of the
earth’s surface, caused by the sudden movement of a
part of the earth’s crust resulting in release of energy
that creates seismic waves.

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There are two types of waves -
1. Primary waves or P waves (longitudinal)
 Also called as the longitudinal or compressional
waves.
 Analogous to sound waves.
 Particles of the medium vibrate along the direction of
propagation of the wave.
 P-waves move faster and are the first to arrive at the
surface.
 These waves are of high frequency.
 They can travel in all mediums.
 Velocity of P waves in Solids > Liquids > Gases.
 Their velocity depends on shear strength or elasticity
of the material.

2. Secondary waves or S waves (transverse)(least
destructive).
 Also called as transverse or distortional waves.
 Analogous to water ripples or light waves.
 S-waves arrive at the surface with some time lag.
 A secondary wave cannot pass through liquids or
gases.
 These waves are of high frequency waves.
 Travel at varying velocities (proportional to shear
strength) through the solid part of the Earth’s crust,
mantle.

#Geography

World’s oldest known natural pearl discovered on Abu Dhabi
Island
The oldest known natural pearl in the world has been discovered by Abu
Dhabi archaeologists working at a Neolithic site on Marawah Island.
Dubbed the ‘Abu Dhabi Pearl’, it was found in layers that have been
radiocarbon during the Neolithic period.

#Geography #Prelim fact

“toothpaste lava”
@ Sometimes high-viscosity magma comes out from the pipe like toothpaste being squeezed out of a tube.
@ The volcanologists sometimes use the term “toothpaste lava” to denote this eruption.
#prelim_2020 #target_shots #Geography

There are 5 states in India ,which are landlock
1.Harayna
2.Jharkhand
3.Chattisgarh
4.Madhya pradesh
5.Telangana

#Geography #Prelim 2020

Isoseismic Line

A line connecting all points on the surface of the earth where the intensity is the same.

#Geography #Prelim2020

Kajin Sara lake -Manang district of Nepal.
This lake in Nepal has set a new record of being the world's highest lake and replaced Tilicho Lake of Nepal. 

#Geography #Map point

#geography #cloud_types

Ciara Strom

@ It is a major storm hit northern Europe, disrupting travel and public events in the region.
@ The storm, named ‘Ciara’ in the UK, is expected to hit Ireland, France, Belgium, the Netherlands, Switzerland, and Germany.
@ In Germany, it is being referred to as ‘Sabine’.
@ The storm has two names because there isn’t yet a pan-European system in place for labeling weather systems.
#Target_Shots #Pre_2020 #Geography

MULA-MUTHA RIVER
Mula-Mutha river cleaning project is a joint project of Union Government and Pune Municipal
Corporation. Government of India has signed a loan agreement with the Japan International
Cooperation Agency (JICA) under the National River Conservation Plan (NRCP) in the year 2015.

#Geography #Prelim2020

OKJOKULL GLACIER

In Iceland, the loss of Okjokull glacier was commemorated by people with a plaque.

The Okjokull glacier was officially declared dead in 2014 at the age of 700 by the Icelandic Meteorological Office when it was no longer thick enough to move.

Okjokull is the first Icelandic glacier to lose its status as glacier.

#Geography #Prelim2020

Mount Harriet National Park

▪️It is located in the south of the Andaman and Nicobar islands.
Mount Harriet is the third-highest peak in the Andaman and Nicobar archipelago next to Saddle Peak in North Andaman and Mount Thuillier in Great Nicobar.
▪️The park is covered with evergreen forest pockets.
▪️It is rich in flora and faunal species like andaman wild pigs, saltwater crocodiles, butterflies and palm trees.

#Pre_2020 #Geography

Asteroids

Asteroids orbit the Sun and are small bodies in the solar system.

They are made up of metals and rocks.

They tend to have shorter and elliptical orbits.

They do not produce a coma or tail atmosphere.

The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars.

#Prelim2020 #volume6 #Geography

Indonesia announced that the country's capital would be relocated to East Kalimantan province on Borneo island from Jakarta.

#Prelim2020 #Geography