# The length of the ravine is 150 m, the average depth is 3 m, and the width is 8 m. What area of land is occupied by the ravine

The length of the ravine is 150 m, the average depth is 3 m, and the width is 8 m. What area of land is occupied by the ravine and what is the volume and mass of the rocks removed from it, if their density is 1.4 g / cm3. 1) Find out the average area of the ravine:
150 m × 8 m = 1200 m2 or 0.12 ha
2) Determine the volume of rocks removed:
1200 m2 × 3 m = 3600 m3 = 36 × 108 cm3
3) Find the mass of rocks taken out of the ravine:
m = V × p = 36 × 108 cm3 × 1.4 g / cm3 = 50.4 × 108 g = 50.4 × 105 kg, i.e. 5 thousand 40 tons
Answer: The area of the ravine is 0.12 hectares. The volume of rocks removed is 3600 m3. The mass of the removed rocks is 5 thousand 40 tons. Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.