Arctic sea ice melts back during summer and grows or "recovers" during winter. The winter maximum extent is usually reached in March. The graph below shows Arctic sea ice extent every September since 1984. Which statement best describes how evidence of Arctic ice melt changed over time?

- The Arctic ice has decreased three million square kilometers in 32 years.
- Arctic ice extent in the year 2016 is equal to Arctic ice extent in 1984.
- Arctic ice extent is lowest in September 2016 and highest in 1984.
- The Arctic ice extent was highest between 2000 and 2016.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

satellites are frequently used to make observations of the orbit on earth

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.