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trekking:

The verb trek has 2 senses (no senses from tagged texts)

1. trek -- (journey on foot, especially in the mountains; "We spent the summer trekking in the foothills of the Himalayas")
2. trek -- (make a long and difficult journey; "They trekked towards the North Pole with sleds and skis")

crossing:

The noun crossing has 7 senses (first 1 from tagged texts)

1. (1) crossing -- (traveling across)
2. ford, crossing -- (a shallow area in a stream that can be forded)
3. crossing -- (a point where two lines (paths or arcs etc.) intersect)
4. intersection, crossroad, crossway, crossing, carrefour -- (a junction where one street or road crosses another)
5. crossing, crosswalk, crossover -- (a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other)
6. hybridization, hybridisation, crossbreeding, crossing, cross, interbreeding, hybridizing -- ((genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids)
7. crossing -- (a voyage across a body of water (usually across the Atlantic Ocean))

The verb cross has 8 senses (first 4 from tagged texts)

1. (47) traverse, track, cover, cross, pass over, get over, get across, cut through, cut across -- (travel across or pass over; "The caravan covered almost 100 miles each day")
2. (7) intersect, cross -- (meet at a point)
3. (1) thwart, queer, spoil, scotch, foil, cross, frustrate, baffle, bilk -- (hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent")
4. (1) cross -- (fold so as to resemble a cross; "she crossed her legs")
5. cross, traverse, span, sweep -- (to cover or extend over an area or time period; "Rivers traverse the valley floor", "The parking lot spans 3 acres"; "The novel spans three centuries")
6. cross -- (meet and pass; "the trains crossed")
7. cross -- (trace a line through or across; "cross your `t'")
8. crossbreed, cross, hybridize, hybridise, interbreed -- (breed animals or plants using parents of different races and varieties; "cross a horse and a donkey"; "Mendel tried crossbreeding"; "these species do not interbreed")

andes:

The noun andes has 1 sense (no senses from tagged texts)

1. Andes -- (a mountain range in South America running 5000 miles along the Pacific coast)

trekking crossing andes

Andes Cross outdoor guiding - Patagonia Argentina
Personalized outdoor guiding around Patagonia Argentina. Trekking, mountain bike, Kayaking, back country skiing, mountaineering, climbing, hiking, in the Northern Patagonia, Argentina. small groups with professional mountain guides. Trekking that crosses the Andes from Argentina to Chile from Bariloche to Puerto Montt at the Pacific ocean over Paso de las Nubes - Tronador and lake Todos los santos.
http://www.andescross.com