Science 8 Online Revision 4

What activity does NOT release greenhouse gases into the atmosphere?

• driving a car
• riding a bicycle
• burning logs in a fire
• cutting down a tree

What is most likely to cause a decrease in salinity of ocean water?

• The sun is warming the ocean water, causing it to expand.
• The sun is warming the ocean water, causing more of it to evaporate and then fall back as rain.
• Glaciers and ice sheets are melting and adding fresh water to the oceans.
• The plant and animal life living in the oceans give off fresh water as part of respiration.

What will most likely happen if global warming continues at the current rate?

• An increase in temperatures will cause the melting of glaciers, and coastal cities will experience flooding.
• A decrease in temperatures will cause glaciers to become larger, and coastal marshes will dry up.
• An increase in temperatures will cause most areas of the world to experience milder weather.
• A decrease in temperatures will cause ocean currents to change direction, and global rainfall will decrease.

What are greenhouse gases?

• gases that are pumped into greenhouses to help keep plants alive
• gases in the atmosphere that trap heat energy
• gases that are highly poisonous when inhaled
• gases that break apart ozone molecules

Which organism is most likely to experience the early negative effects of global warming?

• a tree frog living in the Amazon jungle
• a snake living in the desert in Africa
• phytoplankton drifting in ocean currents
• a polar bear living on ice in the Arctic

Which molecule is most responsible for the adverse effects of pollution and deforestation in Earth's climate?

• hydrogen gas
• carbon dioxide
• methane
• ammonia

Increased levels of carbon dioxide in the atmosphere in the past century is causing

• acid rain
• ozone depletion
• global warming
• smog

The diagram below shows a ball held in place by two blocks. the diameter (width) of the ball is shown between the two blocks. What is the diameter of just the ball?

• 6.0 cm

• 8.0 cm

• 14.0 cm

• 17.0 cm

The diagram below shows a triple beam balance. What is the maximum mass, in grams, the could be measured by this balance?

• 110 g

• 500 g

• 610 g

• 1510 g

The diagram shows water in a graduated cylinder. A student states that the graduated cylinder contains 150 mL of water. This statement is

• a prediction

• an observation

• a theory

• a hypothesis