Anticline and syncline are the two major types of folds found in the earth’s crust.
true or false

True

Reason -

There are basically two major folds :  

a)Anticline fold – An anticline has inverted U shape and has the oldest rock in its center

b) Syncline Fold – It has upward faced U shape and it has the youngest rock in its center

However there are other types of  folds also, namely monocline, Chevron, Slump, Ptygmatic, disharmonic etc.  

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.