An interrelation is considered between an appearance of mid-oceanic ridges, global transgressions and climatic changes, as well as between global transgressions and formation of planation surfaces on continents at that time. Volume of material eroded from the planation surfaces is compared with sediments volume which was brought into oceans and with variations in mineral composition of the sediments produced by erosion of weathering crusts on the surfaces of different age. Connections are traced between swells on passive continental margins and thick sedimentary prisms near continental slopes and huge submarine fans resulting from erosion of mountain ranges of the Alpine and Andean types.

The paper discusses geomorphic features of shelves which had been affected to some extent by the Quaternary ice sheets. The emphasis is on the elements which have been controlled by glaciation-related processes of relief-formation and sedimentation. Analyzing the glaciated shelves topography in the Northern Hemisphere the authors argue in favor of the «Antarctic» model of their evolution during the glaciations on the basis of their own data from high-resolution echosounding and seismic profiling, drilling and also from recent publications.

The proposed classification is the first attempt to systematize materials resulted from hundred years of speleological explorations. It suggests new approach to determination of the cavities classes, sub-classes and types, as well as a unified terminology. There have been distinguished 2 groups, 3 classes, 14 sub-classes and 27 types of cavities which develop practically in all types of rocks known on the planet. The classification provides a theoretical based for distinguishing speleo-objects and subdivision of territory. It may appear usable when developing cadasters of cavities for areas with different geological structure.

On the basis of long-term studies the author sets fortyh a sequence of regional investigations of the descending lithodynamic flow and its geomorphic results. He expounds principles on which a network of basic lithodynamic test sites should be created, which would permit to trace the descending lithoflow using instrumental data. New prospects are outlined and importance of such studies (both from theoretical and practical points of view) is discussed, as well as their applicability to solving many pressing problems of geomorphology, geology and ecology.

A new scale of channel slopes is introduced which directly corresponds to types of channel processes on mountain rivers. Two specific types of mountain channels are distinguished, namely mudflow and rocky types, each of them developing within a certain range of slopes.

The region of the upper and middle reaches of the Mzymta River (near the Krasnaya Polyana) is characterized using classical morphometric approach. The region is subdivided on the basis of engineering-geomorphological characteristics, using an integral index of the geodynamic activity which combines information on horizontal and vertical dissection of topography, slope steepness and exposure.

The catastrophic earthquake of April 29, 1991 in northern Georgia was located within an area of active, highly differentiated neotectectonic movements; they had created mosaic of blocks of different height during the Pliocene-Quaternary which are principal elements of the present-day mountain topography. The main shock and subsequent aftershocks resulted in numerous surficial disturbances of seismic-gravitational and partly seismic-vibrational origin, such as rock falls and debris falls, landslides and rock slides, stony avalanches, snow-mudflows, fissures due to gravitation, vibration and pressure release, stones ejections etc. The seismic dislocations are concentrated within areas of most dense network of recent faults and most contrast movements on them.

Geomorphological research in Tiksi area, Northern Yakutia, revealed evidence for a former marine ice sheet centered on the East Siberian shelf. Fresh-looking U-shaped valleys, giant flutes, rock drumlins, tadpole rocks, scratched boulders, and impressive systems of glacio-tectonic ridges coupled with rock basins («hill-and-hole pairs») were uncovered in the area - all attesting to the past ice motion in landward (NE-SW) direction.

Beginning of lacustrine sedimentation in the rock basins was AMS-radiocarbon dated at 6450±110; 6870±80, and 8500±160 yr BP. Additional evidence for ice-marginal positions and ice-flow directions has been provided by «oriented lakes» of the Yana-Indigirka Lowland.

Spatial position and morphological characteristics of islands are analyzed in the upper reaches of the Amur River. Two varieties of islands are distinguished, their formation being controlled primarily by changes in the internal structure of the flow (self-sustained oscillatory processes) and by drastic environmental changes. Both previously published studies of channel processes and the data obtained by the author indicate the sell sustained oscillations are inherent in the erosional activity of channeled streams.

The paper describes terrace alluvium in valleys in the Southern Sredinny Range of Kamchatka, the region featuring denudational-tectonic topography. The fluvial sequence in the terrace series reveals an alteration of cold and warm periods in the alluviation, which permits to correlate the Quaternary climatic fluctuations on Kamchatka with those in West Siberia. Not less than 8 period of river down cutting are distinguished in the evolution of mountain topography, with periods of glacial erosion and glacio-fluvial sedimentation between them.

Three varieties of straight channels are distinguished, each having a specific position in the field of Q-I diagrams. Conditions of straight channels formation are controlled both by leading factors (river discharge and valley floor slope) and by some local factors.

The paper discusses results of experiments carried out on a hammada surface in the Issyk-Kul region. The results are as follows: 1) the bare surface is actively eroded during the first year after exposure, the process being reduced after the surface having been covered with debris, crust or vegetation; 2) the hammada under study is in stabilized state which is highly resistant to any disturbance; when the surface is broken various accelerated processes begin to act which restore the equilibrium in short time.

10 марта 1993 г. исполняется 80 лет профессору Сергею Сергеевичу Воскресенскому, заслуженному деятелю науки РСФСР, почетному разведчику недр СССР.