Answer: Option [B]The reason behind the drifting away of continents is tectonic activities. The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth’s mantle below the crust. Earthquakes and volcanoes are the short-term results of this tectonic movement.
Answer: Option [D]The correct answer is loess soil. Loess soil are formed by wind dust in and around hot desert.Loess is a type of silt which forms fertile topsoil in some parts of the world.
Answer: Option [B]The largest temperate desert of the world is Patagonian desert. The Patagonian Desert, also known as the Patagonian Steppe, is the largest desert in Argentina and is the 8th largest desert in the world by area, occupying 673,000 square kilometers.
Answer: Option [C]The correct answer is Limestone. When limestone is subjected to the heat and pressure of metamorphism, marble, a metamorphic rock, is formed. Marble is composed of calcite or CaCO3. The calcite in the limestone will recrystallize when under the conditions of metamorphism.
Answer: Option [A]The example of acid igneous rocks is Granite. Acidic rock or acid rock refers to the chemical composition of igneous rocks that has 63% wt% SiO2 content. Rocks described as acidic usually contain more than 20% of free quartz. Typical acidic rocks are granite or rhyolite. Term is used in chemical classification of igneous rock based on the content of silica (SiO2).