Science Unit 3 Lesson 2 Flashcards
How much has Earth’s sirface temperature risen?
about 0.4C(1.62F)
What is global wamring?
The graudaul increase in the overall temperature of Earth’s atmosphere.
What is Climate change?
Clima change is the long-term change of temperature and normal weather patterens in a place.
What are several measurments scientists use to study climate change?
carbon dioxide levels
air temperature
the amount of sea ice at the poles
ocean temperatures
sea levels
glacier size
How do the rings of trees tell us about past climates?
tree rings hold information about past climates. A tree’s rings grow wider in warm, wet weather, and they stay thinner in cold, dry weather. Studying the size of the rings, therefore, gives scientists information about rainfall and temperature at the time each ring was formed.
Scientists use temperatures from previous millennia to study what?
Scientists use temperatures from previous millennia to study the patterns and impacts of climate change over time.
Scientists look at ice formed thousands of years ago to determine what?
Scientists also look at ice formed thousands of years ago to determine the temperature and the amount of carbon dioxide in the atmosphere at the time.
Scientists look at the leftover shells of small animals like foraminifera help determine what?
Scientists can look at the leftover shells of small animals like foraminifera. The percentage of chemical isotopes found in these shells allows scientists to estimate the ocean’s temperature millions of years ago when the animals lived.
How can fossilized pollen grains help us understand climate?
Fossilized pollen grains can also contribute to the record since knowing what kind of plants grew at a particular time indicates what the climate was like.
How do the Ocean help us know about climate change?
Ocean temperatures greatly influence weather and, therefore, climate.
What is Argo do?
An international effort called Argo measures ocean temperatures. About 3,200 floats measure ocean temperature and salinity, which changes based on freshwater input.
What is the meaning of Glacial retreat?
the moving up of the end of a glacier so that it does not extend as far downvalley as it once did
