An environmental scientist gives a demonstration on composting. roger is in the audience. he wonders how composting to slow climate change. what question should he ask to get his answer?

will composting save money for my family?
does composting attract unwanted rodents?
can composting more trees to grow?
does composting smell better than rotting trash?
how many pounds of plastics does a typical family recycle in a month?

Can composting help more trees to grow?

Composting is a process of production of organic matter or humus in the nutrient rich soil. This is a type of recycling process, in which the biodegradable wastes such as plant leaves, stems, twigs, domestic animal dung are mixed with nutrient rich soil. These contents are kept in a dig for a long time and later on used as a natural manure for the growth of agricultural crops or garden plants.

According to the given situation,  Roger should ask Can composting help more trees to grow? because being a novice he is unaware of the use of compost and how it can help in change of climate. The decomposition of household biodegradable waste can cause huge pollution to the environment on the other hand if it is used as a manure for the growth of plants it can change the climate. As, more the number of trees are growing these will capture the carbon dioxide which is a potent greenhouse gas hence, will prevent the increase in the global temperatures.  

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.