b) Write a note on the Plate Tectonie Theory?
c) What are three types of weathering? Describe them with
d) Mention four ways in which the atmosphere sustains lif
Objective Type Questions
104: Fill in the blanks
a) The gaseous cover of the earth is known as
b) The highest waterfall in India is
c) The intensity of an earthquake is measured on a Re
05: One word answers
a) What was the name of the super continent which was
b) The large scale displacement o he rock structure is kno
e) Name any two land forms made b wind?
d) Which is an integral part of the earth
Answers
Answer:
Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle.
Weathering is the breakdown of rocks at the Earth's surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material. There are three types of weathering, physical, chemical and biological.
The atmosphere contains oxygen, the gas living beings need to breathe to stay alive. The moisture it contains is an essential part of the water cycle. Green plants need the carbon dioxide present in the atmosphere for making food
104 )
a) Earth is surrounded by invisible gases that form a thin protective blanket that we call the atmosphere. It contains the oxygen that we breath as well as other important gases such as nitrogen, carbon dioxide, water vapor, and ozone.
b)Kunchikal Falls, Karnataka
c)Intensity: The severity of earthquake shaking is assessed using a descriptive scale – the Modified Mercalli Intensity Scale. Magnitude: Earthquake size is a quantitative measure of the size of the earthquake at its source. The Richter Magnitude Scale measures the amount of seismic energy released by an earthquake.
05
a)Pangaea
c)Name landforms created by erosional and depositional activities of wind. Answer: Pediments and Pediplains, Playas, Deflation Hollows and Caves and Mushroom, Table and Pedestal Rocks are wind's erosional landforms.
d)Biosphere
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