पृथ्वी के आंतरिक भाग में कोर-मेंटल सीमा (गुटेनबर्ग असंबद्धता) भूकंपीय P-तरंगों के वेग में अचानक आने वाली ________ द्वारा चिह्नित होती है।

The crescent-shaped sand dunes found in Sam, Jaisalmer are scientifically known as:

With reference to fjords, consider the following statements: I. They are deep, narrow inlets carved mainly by glaciers and later occupied by seawater. II. The shallow sill near their mouth is generally associated with glacial deposition rather than with tectonic uplift alone. III. They are chiefly associated with high-latitude or formerly glaciated coasts, rather than with humid tropical landscapes. How many of the statements given above are correct?