Which of the following examples illustrates an energy transfer between the atmosphere and hydrosphere?
a plant roots absorbing water from the soil
b polar ice reflecting the sun's light back toward space
c convection currents in the ocean mixing warmer and cooler water together
d loss of heat from a geothermal vent to the surrounding cooler water

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Which changes of state do the labels represent? a: b: c:

What is the scientific definition of energy that relates to work