Balance in the water cycle means that

• the average annual precipitation over Earth equals the amount of water that evaporates
• water that falls to earth only enters oceans
• the amount of water that falls to earth weighs the same as the amount that condenses in clouds
• water that evaporates from earth's surface remains forever in the atmosphere

The ability of a stream to erode and transport material depends largely on its

• width
• density
• velocity
• length

The water cycle is the

• distribution of drinking water on Earth
• unending circulation of Earth's water supply
• the recycling of water after industrial use
• the evaporation of water from earth's surface

A stream's discharge

• decreases between its source and mouth
• remains the same throughout its course
• is greatest during times of drought
• increases between its source and mouth

Base level is

• the lowest point to which a stream can erode its channel
• any part of the stream that is below sea level
• the source from which the stream flows
• the elevation of a stream's largest tributary

Most streams carry the largest part of their load

• as dissolved material
• on their surface
• as bed load
• in suspension

A depositional feature that forms where a stream enters a lake or an ocean is a

• Natural Levee
• meander
• delta
• distributary

The most prominent features of a narrow V-shaped valley where the stream profile drops quickly are

• meanders and floodplains
• rapids and waterfalls
• lakes and ponds
• deltas and natural levees

Which of the following is a source of dissolved salt and chemical substances in the ocean?

• Chemical weathering of rocks
• Evaporation of water from the seas and ocean
• Excretions of marine organisms
• Melting icebergs and sea ice

How do elements such as chlorine, bromine, sulfur, and boron NOT get into the ocean?

• runoff from rivers and streams
• excretions from marine organisms
• volcanic eruptions
• chemical weathering of rocks