▁vol can ic ▁activity ▁cycles ▁and ▁their ▁inter relation ▁with ▁other ▁ge ological ▁and ▁cos mic ▁factors . ▁ ▁Selected ▁publications ▁His ▁studies ▁on ▁global ▁changes ▁in ▁the ▁ge ological ▁environment ▁have ▁made ▁it ▁possible ▁to ▁view ▁Earth ' s ▁climate ▁change ▁processes ▁and ▁ge ological ▁life ▁from ▁a ▁new ▁perspective . ▁These ▁research ▁topics ▁are ▁de alt ▁with ▁in ▁his ▁fundamental ▁mon ograph s ▁and ▁articles : ▁ ▁V . ▁E . ▁Kh ain , ▁E . ▁N . ▁Cy c licity ▁of ▁ge od ynamic ▁processes : ▁its ▁possible ▁nature , ▁Mosk au ▁ 2 0 0 9 ▁ ▁V . ▁E . ▁Kh ain , ▁E . N . K hal il ov . ▁Cy c licity ▁of ▁ge od ynamic ▁processes : ▁Its ▁possible ▁nature . ▁Moscow , ▁Scient ific ▁World , ▁ 2 0 0 9 , ▁p .   5 2 0 ; ▁ ▁V . ▁E ▁. K h ain , ▁E . N . K hal il ov . ▁Sp ati ot empor al ▁patterns ▁of ▁se ism ic ▁and ▁vol can ic ▁activity . ▁Burg as , ▁Bulg aria , ▁SW B , ▁ 2 0 0 8 , ▁p .   3 0 4 ▁ ▁V . ▁E . ▁Kh ain , ▁E . N . K hal il ov . ▁A BO UT ▁PO SS IB LE ▁IN FL U EN CE ▁OF ▁S OL AR ▁A CT IV ITY ▁UP ON ▁SE IS M IC ▁AND ▁V OL C AN IC