A tropical storm becomes a hurricane when its sustained wind speeds exceed ________.

Unconsolidated, water-saturated soils or sediments provide good foundation materials for buildings and other structures.

The natural cause(s) of climate change is(are) ________.

________ dunes result from persistent, onshore winds in certain coastal areas.

Which one of the following statements concerning volcanic blocks and bombs is TRUE?

________ dunes result from persistent, onshore winds in certain coastal areas.

The main goal of paleoclimatology is to understand the climate of the past in order to ________.

Smooth, rounded cobbles and pebbles are found in streams a result of ________.

Dissolved gases may comprise up to a few percent by weight of a magma.

Which one of the following statements concerning volcanic blocks and bombs is TRUE?