Gemini 3 Flash

The hardest natural substance on Earth is **diamond**. Here are a few key facts about why diamonds hold this title: * **Atomic Structure:** A diamond is made of pure carbon. Its hardness comes from its unique crystal structure, where each carbon atom is bonded to four other carbon atoms in a strong, three-dimensional tetrahedral lattice. * **The Mohs Scale:** On the Mohs scale of mineral hardness—which ranks minerals from 1 (softest, like talc) to 10 (hardest)—diamond is the standard for **10**. * **Indestructibility:** Because of their hardness, diamonds can only be scratched by other diamonds. This property makes them ideal for industrial uses, such as cutting, grinding, and drilling through other tough materials. ### Is there anything harder? While diamond is the hardest *naturally occurring* mineral found in abundance on Earth, there are a couple of nuances: 1. **Lonsdaleite (Hexagonal Diamond):** This is a rare substance sometimes found at meteorite impact sites. It is also made of carbon but in a hexagonal lattice. Computer simulations suggest it could be 58% harder than a regular diamond, but natural samples usually contain impurities that make them softer than standard diamonds. 2. **Synthetic Materials:** Scientists have created laboratory materials, such as **Wurtzite boron nitride** or specialized **nanocrystalline diamonds**, that can match or exceed the hardness of natural diamonds, but these are not typically categorized as "natural" substances.

The capital of Australia is **Canberra**.

800Watts

To find out how much profit Josh made, we need to calculate his total costs and the final selling price of the house. ### 1. Calculate the Total Cost First, we add the purchase price to the cost of repairs: * **Purchase Price:** $80,000 * **Repair Costs:** $50,000 * **Total Cost:** $80,000 + $50,000 = **$130,000** ### 2. Calculate the Selling Price The repairs increased the original value ($80,000) by 150%. * **Value Increase:** 150% of $80,000 = $80,000 × 1.5 = **$120,000** * **New House Value (Selling Price):** Original Value + Increase * $80,000 + $120,000 = **$200,000** ### 3. Calculate the Profit Profit is the selling price minus the total costs: * **Profit:** $200,000 (Selling Price) - $130,000 (Total Cost) = **$70,000** Josh made a profit of **$70,000**.

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To find out how much Janet makes at the farmers' market, we need to calculate how many eggs she has left to sell after her daily usage. 1. **Calculate the total number of eggs used daily:** * Eggs for breakfast: 3 * Eggs for muffins: 4 * Total used: 3 + 4 = 7 eggs 2. **Calculate the number of eggs remaining to sell:** * Total eggs laid: 16 * Remaining eggs: 16 - 7 = 9 eggs 3. **Calculate the total earnings:** * Price per egg: $2 * Total earnings: 9 eggs × $2 = $18 Janet makes **$18** every day at the farmers' market.

The capital of Australia is **Canberra**.

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