I. The belt of ancient rocks from Brazil coast matches with those from Western Africa.
II. The gold deposits of Ghana are derived from the Brazil plateau when the two continents lay side by side.
III. The Gondwana system of sediments from India is known to have its counterparts in six different landmasses of the Southern Hemisphere.
Select the correct answer using the code given below.
(a) I and III only
(b) I and II only
(c) I, II and III
(d) II and III only
45. निम्नलिखित में से कौन-से महाद्वीपीय विस्थापन की घटना के साक्ष्य है?
I. ब्राज़ील तट की प्राचीन शैलों की मेखला, पश्चिमी अफ्रीका तट की प्राचीन शैलों की मेखला से मिलती है।
II.घाना के स्वर्ण-निक्षेप ब्राज़ील पठार से व्युत्पन्न होते हैं, जब ये दोनों महाद्वीप अगल-बगल अवस्थित होते हैं।
III. यह ज्ञात है कि भारत के गोंडवाना अवसाद तंत्र के प्रतिरूप दक्षिणी गोलार्ध के छः विभिन्न भूखंडों में मिलते हैं।
नीचे दिए गए कूट का प्रयोग कर सही उत्तर चुनिए।
(a) केवल I और III
(b) केवल I और II
(c) I, II और II
(d) केवल II और III
Answer: C
Explanation:
Continental Drift is the slow movement of the continents across the earth’s surface through geographical time. Continental drift was a theory that explained how continents shift position on Earth’s surface. Set forth in 1912 by Alfred Wegener, continental drift also explained why look-alike animal and plant fossils, and related rock formations, are found on different continents.
Evidence in Support of the Continental Drift
Rocks of Same Age Across the Oceans: The radiometric dating methods developed in the recent period have facilitated correlating the rock formation from different continents across the vast ocean. The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa. The earliest marine deposits along the coastline of South America and Africa are of the Jurassic age.
Placer Deposits: The occurrence of rich placer deposits of gold in the Ghana coast and the absolute absence of source rock in the region is an amazing fact. The gold-bearing veins are in Brazil and it is obvious that the gold deposits of Ghana are derived from the Brazil plateau when the two continents lay side by side.
Tillite: It is the sedimentary rock formed out of deposits of glaciers. The Gondwana system of sediments from India is known to have its counterparts in six different landmasses of the Southern Hemisphere. At the base, the system has thick tillite indicating extensive and prolonged glaciation. Counterparts of this succession are found in Africa. Falkland Island, Madagascar, Antarctica, and Australia besides India.
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