The two most important minerals are calcium and iron. You need calcium for strong ____ (29) and teeth. Iron helps your blood to carry oxygen ____ (30) your body. We normally get our minerals from meat and fish. (29) ____

Once a memory is created it must be stored (no matter how briefly). Many experts think there are three ways we store memories: first in the sensory stage; then in short-term memory; and ultimately, fo...

Tornados occur when the conditions that cause thunderstorms are unusually violent. Winds blow in opposite directions around a strong updraft start a narrow, violent whirl. This is much like stirring w...

Supply & Demand: How Markets Work The two basic terms used most often by economists are supply and demand. The amount of something that is available - the supply - and the amount of something that pe...

Supply & Demand: How Markets Work The two basic terms used most often by economists are supply and demand. The amount of something that is available - the supply - and the amount of something that pe...

Tsunami             Tsunami occurs ehen major fault under the ocean floor suddenly slips. The displaced rock pushes water above it like a giant paddle, producing powerful water waves at the ocean sur...