फेल्डस्पार (Feldspar) खनिज के संदर्भ में निम्नलिखित कथनों पर विचार कीजिए: 1. पृथ्वी की भूपर्पटी (earth's crust) का आधा भाग फेल्डस्पार से बना है। 2. इसका रंग हल्के क्रीम से लेकर सैल्मन पिंक (salmon pink) तक होता है। 3. मैग्नीशियम सभी प्रकार के फेल्डस्पार में एक सामान्य तत्व है। उपरोक्त कथनों में से कौन सा/से सही है/हैं?

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?