41. Seismologists said all three temblors occured at shallow depths and were generated by movements along local faults or trenches. 42. Argon is a very narcotic gas, meaning that it could only be breathed at comparatively shallow depths above. 43. Currently the canal is largely unused, and low bridges and shallow depths have prevented its use for navigation. 44. It is typically found at relatively shallow depths down to, but off Western Australia, it occurs between. 45. At first sight, the defining feature of a mere is its breadth in relation to its shallow depth . 46. The station, designed by Architect S . Volovich, is a single-vault design of shallow depth . 47. Because of its shallow depth , scientists believe it was an active volcanic island throughout the last ice age. 48. The wet clayey soils where water hickory usually is found restricts the entire root system to fairly shallow depths . 49. A shallow depth to bedrock forces the plants to have shallow roots, limiting overall stability and water uptake. 50. A large piece of a stone rodete ( wheel headgear ) was found first, at a shallow depth .
