when do we use although and because?

[Wisemarie]

English Language Tests, Intermediate level

ESL/EFL Test #171 "Common subordinating conjunctions", question 1

Builders use plywood in the construction of small boats ......... it is easy to shape.

(a) although
(b) because
(c) after
(d) while

English Language Tests, Intermediate level

ESL/EFL Test #171 "Common subordinating conjunctions", answer 1

Builders use plywood in the construction of small boats because it is easy to shape.

Correct answer: (b) because
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when do we use although and because?

[Kitosdad]

Builders use plywood in the construction of small boats because it is easy to shape.

That's self-evident.

Builders won't use oak in the construction of small boats although it is easy to shape.
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