Show mighty falls V alls of niagara are crumbling each year the mighty of clasara sl asara are i year rear ly by year ns as thousands of tons ot of rock crash front the up lip of 1 the lie gorge ily by the year IK evl the waters win will have completely worn away the falls ant and there alit rc will he only tte the 16 mile river running down it n cascade dotted bed from lake krie erie to the great zorge sorge of the recent fall of tons of rock was symptomatic of the gradual erosion but bul this incident was only one of a series of crashes that bei yn jin sands of years ago nature la Is a sculptor who never stops working find one of her greatest t molding and remolding weapons Is water visitors now see two cataracts the horseshoe ralls falls on the canadian side and the smaller american falls but once there was only one cataract ests estimate that folli Is www years old fronle tilly the process of nature that formed the alie falls fal Is Is now working steadily tom with almost inconceivable slowness to level them the recent crashing of tons of rock was only one comparatively tiny step in this never ceasing process in one wa way the manner of destruction used by nature in demoll demolishing shIng niagara falls Is unusual all the cataracts on the earth have jinye been beef formed by the wearing away of roca by water the sand and gravel usually swept sept along in the file water helps in the cutting work when there Is a tilt in the river bed or different kinds of rock present cas caa codes cades nod and sometimes waterfalls are created MI lul the water lit in river owing from lake frie Is re inar kably y clear in it there Is practically no sand or gravel v scientists have dis discovered thattie that the top or of the Is 0 of 1 liard hard dolomite dolo with soft shale beneath tills this explains why large pieces of the top rock break 01 olt ol the writer erodes the shale gradually tearing the support from under the dolomite which then hen crashes A down rut nut it breaks off in such a way that the he walls of the falls are left unimpaired as yet put but little by little the dolomite at the crest which forms the lip over which the tha great lakes pour their stupendous ona excess water supply Is disappearing though it 11 difficult to estimate the rate at which the wall Is receding and the gorge at the same time la Is lengthening scientists set the figure at 37 7 feet per ier year this Is how bow they arrive at the conclusion that it will lake until the year 2253 before the li III miles of rock between lake erie fire are completely broken down |