Echo Sounding

The various layers in an ice sheet can be detected by echo sounding, in which pulses of radio waves are sent down into the ice and the resulting echoes analyzed. that you with this they from that she what their would make about know will one time there year think when which them some people take out into just see him your come could now than like other how then our two more these want look first also new because more man find here thing give many well only those one very even back any good woman through life child there work down may after should world school still last need feel three when state never become between high really something most another much family own leave while mean keep student why great same group begin seem help country talk where turn problem every start hand choice citizen classroom consist continent conversation courage cowboy depend discovery disease Dutch queen rabbit realize rocket saved shade shadow straw strip substance suggest teach tears thirty Thomas thread throat tight triangle account attached balloon bark begun flower biggest blank breathing