• Why is the Cambrian period important?
  During the Precambrian, most living creatures were soft-bodied and ...

• What is the San Andreas fault?
  The San Andreas fault is a long transform fault in California. ...

• What were the first animals with backbones?
  Jawless fishes were the first animals with backbones. They appeared ...

• What instruments record earthquakes?
  Seismographs are sensitive instruments that record earthquakes. The ...

• When did plants start to grow on land?
  The first land plants appeared in the Silurian period. Plants ...

• What is raffia?
  Raffia is a natural fibre made from the young leaves of the raphia ...

• What is the tallest tree?
  The California redwood, which grows along the North American Pacific ...

• What is the oldest plant?
  The oldest known plant is probably the creosote bush of the Mojave ...

• What is the largest seed?
  The coco de mer of the Seychelles has the largest seeds, each ...

• Which plant has the longest leaf?
  The raphia palm of tropical Africa produces the longest known leaves. ...