Scrutinize the data and tweets to envisage if the closing price of $cvx will swell or contract at 2015-07-21. Please affirm either Rise or Fall.
Context: date,open,high,low,close,adj-close,inc-5,inc-10,inc-15,inc-20,inc-25,inc-30
2015-07-07,-0.9,0.2,-1.9,0.5,0.5,0.4,2.0,3.0,3.6,4.2,4.9
2015-07-08,1.1,1.6,-0.3,-1.8,-1.8,1.7,3.1,4.4,5.1,5.7,6.4
2015-07-09,1.2,1.5,-0.0,0.2,0.2,0.9,2.3,3.7,4.4,5.1,5.9
2015-07-10,0.1,0.6,-0.4,0.7,0.7,-0.1,1.2,2.6,3.4,4.1,4.8
2015-07-13,-0.3,0.3,-0.5,0.2,0.2,-0.3,0.6,2.1,2.9,3.6,4.3
2015-07-14,-1.2,0.3,-1.2,1.0,1.0,-1.2,-0.5,0.7,1.7,2.4,3.0
2015-07-15,0.8,1.5,-0.4,-1.4,-1.4,0.3,0.6,1.7,2.8,3.5,4.2
2015-07-16,-0.2,0.3,-0.6,0.3,0.3,0.2,0.2,1.1,2.2,3.0,3.6
2015-07-17,1.2,1.3,-0.3,-1.4,-1.4,1.3,1.3,2.2,3.3,4.1,4.8
2015-07-20,0.4,0.6,-0.4,-0.2,-0.2,1.2,1.4,2.0,3.2,4.0,4.8

2015-07-09: $cvx:notable session mover: chevron corporation (nyse:cvx):|$cvx - pope inspires catholic investors to press environmental concerns 
2015-07-11: cvx chevron corp. filings$cvx $aria $amgn $nflx #cvx #investing #nasdaq|pfe pfizer, inc. open$pfe $abbv $cvx $kbe #pfe #nasdaq #nasdaq|kbe spdr kbw bank index etf exchange$kbe $cvx $dal $wfc #kbe #sto
2015-07-12: lnkd linkedin corp. filings$lnkd $stem $cvx $amat #lnkd #stockmarket #investing|dow dow chemical co. day high$dow $exel $ma $cvx #dow #nasdaq #nasdaq bosocial  bosocial
2015-07-13: amzn  inc. chart$amzn $cvx $tpac $lvlt #amzn #finance #finance|cvx chevron corp. summary$cvx $pfe $nat $goog #cvx #finance #investing
2015-07-15: chevron: a deeply undervalued high yield dividend aristocrat  $cvx|rt dennyt14: cvx chevron corp. current price$cvx $nke $goog $xlf #cvx #nasdaq #stocks b… …|cvx chevron corp. volume$cvx $twtr $xiu.to
Answer:
Rise