Definitions for lavaka
lava·ka

WikipediaRate this definition:0.0 / 0 votes

1. Lavaka

   Lavaka, the Malagasy word for "hole", usually found on the side of a hill, is a type of erosional feature common in Madagascar. However, lavakas have also been found in South Africa, the Democratic Republic of the Congo, and South Carolina, and similar landforms have been found in Brazil, the Great Plains of the U.S., and Swaziland. They are most common in tropical regions between the Cancer and Capricorn latitudes, especially the Central Highlands of Madagascar, where approximately one metre thick laterites develop on steep terrains in a monsoonal climate. Lavakas form where these hard laterites overlie thick (tens of metres) saprolite, on steep (35 to 55 degree) slopes, in areas that have a hot dry season and a warm wet season. Lavakas are not landslides. They are a type of gully, formed via groundwater sapping. They are usually shaped like a tear-drop with a steep, round headwall that narrows downhill into a shallow outlet channel. Although human activities—such as deforestation, overgrazing, road creation, and grassland burning—can contribute to lavaka formation, lavakas can also develop by purely natural processes. Air photos reveal remnants of ancient lavakas in recently deforested areas, showing that those areas were eroded by lavakas before the rain forests grew; and C14 dating (radiocarbon dating) indicates that some lavakas are up to 20,000 years old, meaning they were present in the Malagasy landscape before the arrival of humans (human arrival in Madagascar is <2000 years before present). Among the natural controls on lavaka formation are the amount of seismic activity in the region, the topographic relief (or slope), and hydraulic conductivity of materials in the saprolite. For instance, earthquakes in the region can cause cracks in the hard, upper layer of laterite, which allows water to seep into the more porous layer of saprolite underneath. This causes chemical reactions within the saprolite to leech certain minerals from the rock and if the hydraulic conductivity of that rock is high enough, the water can carry those minerals away, which can cause the infrastructure of that rock to collapse and erode. Lavakas can often cause a lot of damage to nearby communities. During the monsoon season, heavy rains carry away all the eroded material from the lavaka, which can destroy surrounding crops and infrastructure. This is the basis for much of the recent research that has been conducted on the variables involved in lavaka formation (especially in Madagascar, where lavakas pepper the Central Highland landscape). The term "lavaka" entered the international geography / geology vocabulary following the work of Riquier (1954).

Surnames Frequency by Census RecordsRate this definition:0.0 / 0 votes

1. LAVAKA

   According to the U.S. Census Bureau, Lavaka is ranked #130610 in terms of the most common surnames in America.
   
   The Lavaka surname appeared 130 times in the 2010 census and if you were to sample 100,000 people in the United States, approximately 0 would have the surname Lavaka.
   
   86.1% or 112 total occurrences were Asian.
   7.6% or 10 total occurrences were of two or more races.
   3.8% or 5 total occurrences were White.

How to pronounce lavaka?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say lavaka in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of lavaka in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of lavaka in Pythagorean Numerology is: 3

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Lavaka
2. ^ Surnames Frequency by Census Records
   https://www.census.gov/topics/population/genealogy/data/2010_surnames.html