With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: They can be bleak and eerie , often very exposed , often covered with antiquities like bronze age burial mounds , stone circles and settlements -- until late in the bronze age they were rich farmlands , then a change in the climate caused the skies to cloud over and rain to wash the goodness from the soil .
text_B: The causing happened
entailed.