Changes in Carbon stored in ice, oceans and the biosphere

Most of the earth's carbon is stored in rocks

• True

• False

In the 1990s, human activity added how many PgC of Carbon annually?

Match the percentages to the storage type

• 85%

• Oceans

• 2%

• Fossil fuels

• 5%

• Biomass

• 8%

• Atmosphere

Between the years 2000 and 2008, how many PgC of Carbon were added to the earth's atmosphere annually by human activity?

• 9.1 PgC

• 10.1 PgC

• 19.1 PgC

• 0.91 PgC

About ​ (a)   of the carbon that humans have put into the ​ (b)   has ​ (c)   in to the ​ (d)   .

• 30%
• atmosphere
• oceans
• diffused
• biosphere
• hydrosphere
• evaporated
• 40%
• soils

Since 1750, oceanic pH has dropped by about __.

• 0.1

• 0.2

• 0.3

• 0.4

What do shellfish rely on access to, to create their shells?

• bi-carbonate

• carbonic acid

• carbonate

• carbon dioxide

Name a type of organism impacted by more acidic oceans

By what process do shellfish absorb carbonate?

• osmosis

• symbiosis

• photosynthesis

• plasmosis

Why would the loss of shellfish stocks be problematic to ecosystems?

• They are part of the food chain and their loss would impact other species

• They are of significant economic value in fisheries

• Filter feeding organisms act as water purifiers which maintain mineral and metal levels for other life

• Shellfish create bands under the water, which entertain the other organisms in the ocean, and the mermaids