What two geographic features mark the edges of the European continent (East and West)?

The graph below plots the temperature and luminosity of stars on the main sequence.

Which outcome is not caused by gravitational forcea. gas and dust come together to form a planet b. planets orbit a star c. two atoms come together to form a molecule d. stars cluster to form a galaxy

The mechanization of agriculture has resulted in all of the following excepta increased productionb. an increased ability to feed growing global populationsc. decreased erosion as a result of advanced planting machinesd. increased employment in the farming industry