Geographically these tectonic plates
are grouped as seven continents and five oceans. Let us learn more about the
continental plates and their features in this article.
The Continents and its features:
A continent is defined as a large unbroken land mass
completely surrounded by water, although in some cases continents are connected
by land bridges. The seven continents are North America, South America, Europe,
Asia, African, Australia, and Antarctica. The island groups in the Pacific are
often called Oceania. These continents occupies nearly 29% of the Earth's total
area. Mountains, Plateaus and plains are significant features of those
continents.
A mountain is a landmass that stands significantly above its
surrounding. The majority of mountains are created when tectonic plates
collide, causing folding and uplifting of rocks along the plate boundaries. The
uplifted land is then eroded into peaks and valleys.
A plateau is another feature of the Earth's surface. They
are broad uplands that rise abruptly from the surrounding area. The majority of
them are created when tectonic plates pulled, causing faulting and slipping
down of rocks along the plate boundaries. Tibet, the highest plateau of the
world, Colorado plateau, Decan Plateau, and East African Plateau are
noteworthy.
A plain is a vast, low-lying areas of the continents. They
are formed in different ways. Plains made through the actions of rivers are
called alluvial plains; the Ganges, the Brahmaputra are the largest river
plains in the world.
The plains made through wind sedimentation are called loess.
The plain formed where the Yellow River flows in China is loess. Similarly, the
plains formed through the actions of waves are called coastal plains. The
eastern coastal plain of India is a good example.
Mountains, plateaus and plains are
all part of lithosphere and they are made up of many types of rocks. Some rocks
are white and some others are black. A few rocks are brittle and others are
hard; some are like sand, are permeable, others, such as clay, are
non-permeable. Rocks are composed of many minerals such as silica, aluminum,
iron and magnesium. The nature of the rock is determined by the presence of its
minerals. Rocks can be classified into three types based on their formation.
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