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What belongs in each mystery box?

Every mystery box holds the same value. Make the two sides balance.

2 × ? + 315Equal values make a level balance.

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ScienceAges 7-9Earth science
Question 1 of 4
Rocks, fossils & soil layers

What do we call a rock that does NOT allow water to pass through it because its crystals interlock tightly without gaps (such as granite or slate)?

Compare igneous, sedimentary and metamorphic rocks, fossil formation, permeability and soil horizons.

Topsoil → Subsoil → Bedrock
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Science category

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