Thermal energy is transferred throughout earth by which of the following processes?

a
nuclear fission and nuclear fusion

b
radiation, convection, and conduction

c
photosynthesis and nitrogen fixation

d
weathering, erosion, and deposition

which of the following is most responsible for the uneven distribution of solar energy on earth and therefore the cause of the different seasons?

a
earth's tilt

b
earth's rotation

c
earth's revolution

d
earth's distribution of land and water
put the steps of the carbon cycle in order.

drag each step to put them in order starting with how carbon enters the atmosphere as step 1.
1
carbon is released as carbon dioxide from respiration and the burning of fossil fuels.

2
plants perform photosynthesis by absorbing carbon dioxide.

3
dead plants and animals are broken down by decomposers.

4
carbon passes through the food chain as animals eat or are eaten by other animals.
an ecologist notes an increase in algae growth in a river adjacent to a farm that uses fertilizers. what can she infer from this information?

a
the water contains too little phosphorus.

b
the water contains too much phosphorus.

c
the water could contain too much nitrogen or phosphorus, but there is not enough information to tell which.

d
the water contains too much nitrogen.
a scientist studying a swamp notes that it contains a high concentration of organic carbon. this region would be classified as what?

a
carbon cycle

b
carbon cell

c
carbon source

d
carbon sink