Question Detail Thickness of Mantle Layer is about ? 2900 Km3100 Km3300 Km3500 Km Answer: Option AExplanation:Mantel Layer is below the Crust layer of earth. Ad Similar Questions : 1. Which among following is also known as "Island of pearls" ? AustraliaMadagascarBahrainSaudi Arabia Answer: Option CExplanation:Australia is also known as "Island Continent", Madagascar is also known as "Island of cloves". 2. Which National highway joins Delhi to Lucknow ? NH 22NH 24NH 47NH 48 Answer: Option B 3. Which country has the largest coast line ? USA BrazilAustraliaCanada Answer: Option D 4. Study of the Universe is known as ? SociologyCosmologyUniversologyPetology Answer: Option B 5. "Titan" is satellite of ? MercuryEarthVenusSaturn Answer: Option DExplanation:"Titan" is satellite of Saturn and is the largest satellite in the Solar System. Read more from - Geography Questions Answers