Adolescence /ˌæd

crop /krɒp/ /krɑːp/ noun PLANT
1. [ C ] (the total amount collected of) a plant such as a grain, fruit or vegetable grown in large amounts
The main crops grown for export are coffee and rice.
a bumper (= very good) potato crop
decline /dɪˈklaɪn/ noun [ S or U ]
when something becomes less in amount, importance, quality or strength
industrial decline
Home cooking seems to be on the/in decline (= not so many people are doing it) .
a decline in the number of unemployed
She seemed to be recovering and then she went into a decline.
den /den/ noun [ C ] FOR ANIMALS
1. the home of particular types of wild animal
den /den/ noun [ C ] FOR CHILDREN
2. a rough structure, usually built outside from pieces of wood, cardboard, etc., in which children play
disaster /dɪˈzɑː.stə r / /-ˈzæs.tɚ/ noun [ C or U ]
1. (an event which results in) great harm, damage or death, or serious difficulty
An inquiry was ordered into the recent rail disaster (= a serious train accident) .
It would be a disaster for me if I lost my job.
This is one of the worst natural disasters ever to befall the area.
Heavy and prolonged rain can spell disaster for many plants.
Everything was going smoothly until suddenly disaster struck .
Inviting James and Ivan to dinner on the same evening was a recipe for disaster (= caused a very difficult situation) - they always argue with each other.
2. be a disaster
informal to be very unsuccessful or extremely bad
The evening was a complete disaster.
As an engineer, he was a disaster.
ecological /ˌiː.kəˈlɒdʒ.ɪ.k ə l/ /-ˈlɑː.dʒɪ-/ adjective
relating to ecology or the environment
The destruction of the rain forests is an ecological disaster.
ecology /ɪˈkɒl.ə.dʒi/ /-ˈkɑː.lə-/ noun [ U ]
the relationships between the air, land, water, animals, plants, etc., usually of a particular area, or the scientific study of this
The oil spill caused terrible damage to the fragile ecology of the coast.
She hopes to study ecology at college.
evolution /ˌiː.vəˈluː.ʃ ə n/ , /ˌev.ə-/ noun [ U ]
1. the way in which living things change and develop over millions of years
Darwin's theory of evolution
2. a gradual process of change and development
the evolution of language