Select the incorrect statement concerning the effects of hallucinogens like lsd.
a. they can cause vivid and unusual visual and auditory effects.
b. the user is usually able to control the psychedelic experience.
c. the user can experience a sense of cosmic merging.
d. a sense of lost identity caused by using a hallucinogen can be very disturbing to some users.

The incorrect statement is : b. The user is usually able to control the psychedelic experience.

Explanation:

Hallucinogens, such as LSD, are a class of psychoactive drugs that causes hallucinations, distortions in perceptions of reality, alters the awareness of surroundings and substantial subjective changes in the consciousness, thoughts and the emotions. Thus, the psychedelic experience caused by the hallucinogens can not be controlled.

The various effects of LSD are:

Distorted perception of time and space, vivid perception including auditory and visual effects, sense of cosmic merging and lost identity.

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.