Table of Contents

Main Factors of Hazards Due to Comets and Asteroids.- Size-Frequency Distribution Of Asteroids And Impact Craters: Estimates Of Impact Rate.- Cometary Hazards.- Bolides in the Earth Atmosphere.- Geologic Effects of Large Terrestrial Impact Crater Formation.- Thermal Radiation and Fires After Impacts of Cosmic Objects.- Tunguska Catastrophe of 30 June 1908.- High-Velocity Impact Ejecta: Tektites and Martian Meteorites.- Marine Target Impacts.- Ionospheric and Magnetospheric Effect.- Impacts and Evolution of Early Earth.