-- card: 41768 from stack: in.11
-- bmap block id: 0
-- flags: 0000
-- background id: 5746
-- name: greenhousel


-- part 1 (button)
-- low flags: 00
-- high flags: 0000
-- rect: left=445 top=21 right=59 bottom=474
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: New Button
----- HyperTalk script -----
on mouseUp
  visual effect wipe right
  go to card "greenhouse"
end mouseUp



-- part 2 (button)
-- low flags: 00
-- high flags: 0000
-- rect: left=411 top=21 right=59 bottom=443
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: New Button
----- HyperTalk script -----
on mouseUp
  visual effect wipe left
  go to previous card
end mouseUp



-- part 3 (button)
-- low flags: 00
-- high flags: A003
-- rect: left=362 top=30 right=48 bottom=407
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Print
----- HyperTalk script -----
on mouseUp
  doMenu "Print Card"
end mouseUp



-- part contents for background part 1
----- text -----
Greenhouse Gases Cause Warming

-- part contents for background part 2
----- text -----
3. Polar Ice: Temperature and CO2 Records

-- part contents for background part 6
----- text -----
  Ice cores from centuries-old ice deposits in Antarctica and Iceland provide scientists with records of both global temperatures and CO2 concentrations dating back as far as 160,000 years.  The analysis of these ice deposits represents a clever piece of scientific detective work.  These analyses show that past temperatures and CO2 levels have risen and fallen together. 
  To determine the historical CO2 levels in the atmosphere, the bubbles trapped in the ice are analyzed for the CO2 concentration - the air is trapped as light density snow is gradually compressed by the weight of new layers to form ice. 
  Isotopes of oxygen atoms (18 O and 16 O) in the ice molecules give estimates of the Earth's temperature during these ancient times.  Scientists measure the ratio of the ice formed with heavy water,containing the 18 O isotope, to the normal water consisting of 16 O atoms.  When the earth is warm, more of the heavier water containing 18 O evaporates to become snowfall, resulting in a higher ratio of 18 O in ice from that period. ***