What is generation time for bacteria?

A generation time for bacteria varies from bacteria to bacteria.

Explanation:

The time taken for a bacteria to double in number is known as generation time.

bacteria reproduce very fast and the generation aslo varies. some generation time for other bacteria is 20 minutes while others are 10 and others 30

this generation time is determined by the environment in which the bacteria is hence determining its generation

not too sure but maybe in the hot springs.

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.